user: You are a structured reasoning expert tasked with solving problems step by step. 
You first think about the reasoning process in the mind and then provide the answer. The reasoning process and answer should be enclosed within <think> </think> and <answer> </answer> tags, respectively, i.e., <think> reasoning process here </think> <answer> answer here </answer>. 
Given a question and the associated knowledge graph triplets (entity, relation, entity), you are asked to answer the question with these triplets and your own knowledge. 
You can break down the original question into several sub-questions and explore the given knowledge graph to solve them step-by-step. If there are multiple possible answers, choose one as the final answer. 
After thinking, when you finally reach a conclusion, clearly state the answer within <answer> </answer> tags, i.e., <answer> answer here </answer>. 
Question: what year was the great san francisco fire? 
Knowledge Triplets: San Francisco, common.topic.webpage, m.09w8sgp
San Francisco, book.book_subject.works, Savages
m.0b48ht8, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0b48ht8
San Andreas Fault, user.robert.earthquakes.seismic_fault.earthquakes, 1906 San Francisco earthquake
San Francisco, book.book_subject.works, Fade to clear
San Francisco, common.topic.webpage, m.09y56v7
m.09ybmx4, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xyfmk
San Francisco, common.topic.webpage, m.0b4827b
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.duration, 60.0
San Francisco, film.film.starring, m.0cw0sdq
San Francisco, common.topic.webpage, m.09wz41k
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.editions, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
San Francisco, book.book_subject.works, Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013)
San Francisco, film.film_location.featured_in_films, Mrs. Doubtfire
m.0b48bk0, common.webpage.topic, San Francisco
m.09wt6tt, common.webpage.topic, San Francisco
m.09wz41k, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The vanished
m.09wtp55, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, And the Sea Will Tell
San Francisco, common.topic.webpage, m.0b46t1y
m.0b48p4h, common.webpage.topic, San Francisco
1906 San Francisco earthquake, common.topic.notable_types, Disaster
m.09w8sgp, common.webpage.topic, San Francisco
m.09wm0d1, common.webpage.topic, San Francisco
1906 San Francisco earthquake, film.film_subject.films, San Francisco
m.09xlcpd, common.webpage.topic, San Francisco
m.0bqsy6x, award.ranking.item, San Francisco
Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013), book.written_work.subjects, San Francisco
San Francisco, common.topic.webpage, m.09wf1j0
San Francisco, common.topic.webpage, m.09x44m3
San Francisco, common.topic.webpage, m.0b46cf9
San Francisco, film.film.starring, m.0cg1z7f
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.article, m.025vy7q
m.022q11g, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09ytjp2
Balfour Guthrie and Co. San Francisco Office, event.disaster_affected_structure.destroyed_by_disaster, 1906 San Francisco earthquake
m.09wf1j0, common.webpage.topic, San Francisco
San Francisco, film.film.starring, m.0cs6s7n
m.09y92wl, common.webpage.topic, San Francisco
1906 San Francisco earthquake, event.disaster.structures_destroyed, Balfour Guthrie and Co. San Francisco Office
San Francisco, common.topic.notable_for, g.1255z32m2
San Francisco, book.book_subject.works, Annabel Scheme
San Francisco SEO, common.topic.subjects, San Francisco
m.0b46cf9, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wpgp4
San Francisco, common.topic.webpage, m.09w6wtc
m.09yt_t_, common.webpage.topic, San Francisco
m.09wcrgb, common.webpage.topic, San Francisco
m.09y948d, common.webpage.topic, San Francisco
San Francisco, travel.travel_destination.tourist_attractions, San Francisco Fire Department Museum
San Francisco, common.topic.webpage, m.09yt_t_
San Francisco, book.book_subject.works, Further Tales of the City
San Francisco Fire Sacramento Street 1906-04-18, common.image.appears_in_topic_gallery, Looking Down Sacramento Street, San Francisco, April 18, 1906
m.02kpz3y, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.0fpsk0j
m.09y9t54, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Sister Noon
1906 San Francisco earthquake, event.disaster.surviving_structures, Westin St. Francis
m.0fpsk0j, common.webpage.topic, San Francisco
m.0b6rdz3, common.webpage.topic, San Francisco
m.0b48qmn, common.webpage.topic, San Francisco
Herb Caen's San Francisco: 1976-1991, book.written_work.original_language, English Language
Locked Rooms, book.written_work.subjects, 1906 San Francisco earthquake
m.09x3hrs, common.webpage.topic, San Francisco
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, common.topic.notable_for, g.1256kn6_6
San Francisco, common.topic.webpage, m.09wq6jn
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.editions, A crack in the edge of the world : America and the great California earthquake of 1906
San Francisco, common.topic.webpage, m.09xk6vh
m.0b4827b, common.webpage.topic, San Francisco
Palace Hotel, San Francisco, event.disaster_affected_structure.survived_disasters, 1906 San Francisco earthquake
m.09yb31v, common.webpage.topic, San Francisco
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.total_damage, m.03rtjky
San Francisco, common.topic.webpage, m.09y4yjk
m.09wpzr3, common.webpage.topic, San Francisco
m.09wmxdf, common.webpage.topic, San Francisco
m.09xzf2y, common.webpage.topic, San Francisco
1906 San Francisco earthquake, book.book_subject.works, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
WWDC 2012, conferences.conference.venue, San Francisco
Simon Winchester, book.author.works_written, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.notable_types, Artwork
m.09xk6vh, common.webpage.topic, San Francisco
m.0wg9gvc, location.partial_containment_relationship.partially_contains, San Francisco
m.0b47y72, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xzf2y
San Francisco, common.topic.article, m.0c1pb
m.0myh7st, award.award_honor.honored_for, San Francisco
San Francisco, common.topic.subject_of, San Francisco SEO
m.09x4f_j, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y228s
San Francisco, book.book_subject.works, 1st to Die
1906 San Francisco earthquake, event.disaster.structures_destroyed, Palace Hotel, San Francisco
San Francisco, film.film.genre, Disaster Film
San Francisco, common.topic.webpage, m.02kpz46
San Francisco, common.topic.webpage, m.0b46qyl
San Francisco, film.film.starring, m.0cg4xym
m.0zwsh__, location.partial_containment_relationship.partially_contained_by, San Francisco
m.09y60fg, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The 6th Target
San Francisco, common.topic.webpage, m.09y978r
San Francisco, book.book_subject.works, Shotgun Alley
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.book.editions, After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire
m.09y228s, common.webpage.topic, San Francisco
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.image, San Francisco Fire Sacramento Street 1906-04-18
San Francisco, film.film.starring, m.0cg131_
San Francisco, common.topic.webpage, m.09x4f_j
San Francisco, common.topic.webpage, m.094t_kq
San Francisco, film.film.film_festivals, 1985 Berlin International Film Festival
m.09wjmzw, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wtp55
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.book.genre, Coffee table book
San Francisco, common.topic.subject_of, Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013)
San Francisco, common.topic.webpage, m.09yj4m3
San Francisco, common.topic.webpage, m.09xlcpd
San Francisco, common.topic.webpage, m.022q11g
m.09ytjk1, common.webpage.topic, San Francisco
1906 San Francisco earthquake, base.schemastaging.context_name.pronunciation, g.125_nh8xf
San Francisco, common.topic.webpage, m.09wjmzw
San Francisco, book.book_subject.works, Dynamite road
San Francisco, common.topic.webpage, m.0g_qdd6
San Francisco, common.topic.subject_of, Robin Duke
San Francisco, common.topic.webpage, m.09x5l82
San Francisco, book.book_subject.works, The Way Some People Die
San Francisco Fire Department, government.government_agency.jurisdiction, San Francisco
San Francisco, common.topic.webpage, m.09ytjk1
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.genre, Non-fiction
Herb Caen's San Francisco: 1976-1991, book.written_work.subjects, San Francisco
m.09xhnkt, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Golden Gate
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, common.topic.article, m.0649cq2
1906 San Francisco earthquake, event.disaster.surviving_structures, Palace Hotel, San Francisco
San Francisco, common.topic.image, San Francisco Skyline
m.09x5l82, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09wt6tt
San Francisco, book.book_subject.works, The Barbary Coast
San Francisco, book.book_subject.works, Herb Caen's San Francisco: 1976-1991
San Francisco, book.book_subject.works, Night Work
m.09xmh4d, common.webpage.topic, San Francisco
Herb Caen's San Francisco: 1976-1991, common.topic.notable_types, Book
m.09x3sv5, common.webpage.topic, San Francisco
m.0b48njf, common.webpage.topic, San Francisco
m.09wlk8m, common.webpage.topic, San Francisco
m.09y5c2z, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xhnkt
San Francisco, book.book_subject.works, 2nd Chance
The Great Earthquake and Firestorms of 1906, common.topic.notable_types, Book
San Francisco, common.topic.webpage, m.09wmxdf
m.09yj4m3, common.webpage.topic, San Francisco
m.09yvkr0, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Lights of Earth
San Francisco, common.topic.webpage, m.0b47y72
m.09wpgp4, common.webpage.topic, San Francisco
Westin St. Francis, event.disaster_affected_structure.survived_disasters, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09y72nh
m.09w6wtc, common.webpage.topic, San Francisco
m.09ykr7w, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09w6m0k
1906 San Francisco earthquake, base.newsevents.photographed_event.photograph_s, Looking Down Sacramento Street, San Francisco, April 18, 1906
Mrs. Doubtfire, film.film.featured_film_locations, San Francisco
San Francisco, common.topic.webpage, m.09w1nrz
San Francisco, book.book_subject.works, Tales of the City
San Francisco, base.biblioness.bibs_topic.subsumes, San Francisco
San Francisco, film.film.starring, m.02h_4yx
San Francisco, book.book_subject.works, Nightcrawlers
Looking Down Sacramento Street, San Francisco, April 18, 1906, common.topic.notable_for, g.125cqdww9
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.subjects, 1906 San Francisco earthquake
The Great Earthquake and Firestorms of 1906, book.written_work.subjects, United States of America
m.0b46s2b, common.webpage.topic, San Francisco
m.09ybqp0, common.webpage.topic, San Francisco
m.09y56v7, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Unbound feet
San Francisco, common.topic.webpage, m.09x1nxq
San Francisco, film.film.starring, m.0cr_8k2
The Great Earthquake and Firestorms of 1906, book.written_work.subjects, California
1906 San Francisco earthquake, event.disaster.survivors, Jack London
m.09x0gnt, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09w8m7x
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, common.topic.article, m.064g58h
San Francisco, common.topic.webpage, m.09wjsz8
m.09w6m0k, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09x3mn3
San Francisco, book.book_subject.works, Dead midnight
San Francisco, common.topic.webpage, m.0b48p4h
San Francisco, common.topic.webpage, m.09y9t54
San Francisco, common.topic.webpage, m.09y9bqs
m.09wq6jn, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, 7th Heaven
m.02kpz46, common.webpage.topic, San Francisco
San Francisco, film.film.edited_by, Tom Held
m.09xh6pb, common.webpage.topic, San Francisco
m.09y5d51, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The dangerous hour
m.09ytkc6, common.webpage.topic, San Francisco
m.02_w9xr, user.robert.earthquakes.earthquake_magnitude.earthquake, 1906 San Francisco earthquake
Earthquake, event.disaster_type.disasters_of_this_type, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09y632v
1906 San Francisco earthquake, user.avh.default_domain.ellerdale_topic.ellerdale_id, 0098-949f
San Francisco, common.topic.webpage, m.09wyt0j
San Francisco, film.film.starring, m.0cg7h5n
San Francisco, common.topic.webpage, m.09y948d
San Francisco, common.topic.webpage, m.09wcrgb
m.09x1nxq, common.webpage.topic, San Francisco
San Francisco, common.topic.notable_for, g.1259264lw
m.09y72nh, common.webpage.topic, San Francisco
m.09xqp71, common.webpage.topic, San Francisco
Simon Winchester, book.author.book_editions_published, A Crack in the Edge of the World: America and the Great California Earthquake of 1906
m.09w1wgb, common.webpage.topic, San Francisco
Post-and-Grant-Avenue, common.image.appears_in_topic_gallery, 1906 San Francisco earthquake
m.05cbxh6, award.award_nomination.nominated_for, San Francisco
San Francisco, common.topic.webpage, m.09wlk8m
San Francisco, common.topic.webpage, m.0b46s2b
San Francisco, common.topic.webpage, m.09ybqp0
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.book.editions, After the ruins, 1906 and 2006 : rephotographing the San Francisco earthquake and fire
San Francisco, common.topic.webpage, m.09y5c2z
San Francisco, location.location.events, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09x6llg
Looking Down Sacramento Street, San Francisco, April 18, 1906, base.newsevents.photograph.photographed_event, 1906 San Francisco earthquake
1906 San Francisco earthquake, common.topic.notable_for, g.1259pqvnv
m.09wg_8f, common.webpage.topic, San Francisco
m.09ylkyw, common.webpage.topic, San Francisco
San Francisco, government.governmental_jurisdiction.agencies, San Francisco Fire Department
m.05c5l2s, award.award_nomination.nominated_for, San Francisco
San Francisco, common.image.appears_in_topic_gallery, San Francisco
San Francisco, common.topic.subjects, http://www.sanfranciscosightseeing.com/
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.fatalities, m.02_w95l
m.0qymvcv, dataworld.gardening_hint.last_referenced_by, 1906 San Francisco earthquake
m.09x6llg, common.webpage.topic, San Francisco
1906 San Francisco earthquake, event.disaster.fatalities, 3000
The Great Earthquake and Firestorms of 1906, book.written_work.subjects, San Francisco
m.09xyfmk, common.webpage.topic, San Francisco
m.09w8m7x, common.webpage.topic, San Francisco
San Francisco, common.topic.article, m.0d6l_
m.0h2sfwg, common.webpage.topic, San Francisco
m.094t_kq, common.webpage.topic, San Francisco
1906, book.written_work.subjects, California
San Francisco, common.topic.webpage, m.09yb31v
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.author, Michael Lundgren
m.0g_qdd6, common.webpage.topic, San Francisco
1906 San Francisco earthquake, book.book_subject.works, After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire
San Francisco, common.topic.webpage, m.0cj8mwt
1906 San Francisco earthquake, event.disaster.damage, m.05bvd_b
San Francisco, common.topic.article, m.022q0vq
San Francisco, common.topic.webpage, m.09yvkr0
m.022q122, common.webpage.topic, San Francisco
m.09yxjs0, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y22fm
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.fault, San Andreas Fault
1906 San Francisco earthquake, event.disaster.type_of_disaster, Earthquake
m.09ytjp2, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Bindlestiff
San Francisco, common.topic.webpage, m.09xqp71
San Francisco, book.book_subject.works, Oh the Glory of It All
San Francisco, common.topic.webpage, m.09ytkc6
San Francisco, film.film.starring, m.0cw0jrd
1906 San Francisco earthquake, event.disaster.surviving_structures, San Francisco Mint (structure)
1906 San Francisco earthquake, common.topic.article, m.01f6rx
San Francisco, film.film.starring, m.02h_4zb
m.09w1nrz, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Basic Eight
San Francisco, book.book_subject.works, Address unknown
San Francisco, film.film.country, United States of America
m.09y9lh7, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09yp6yq
San Francisco, common.topic.webpage, m.09w8dlz
San Francisco, common.topic.webpage, m.09wpzr3
San Francisco, film.film.starring, m.0cs034k
San Francisco, book.book_subject.works, Mourners
m.09w8dlz, common.webpage.topic, San Francisco
m.09x70ns, common.webpage.topic, San Francisco
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, common.topic.notable_for, g.1256bxdws
San Francisco, book.book_subject.works, 1906
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, common.topic.notable_types, Book
1906 San Francisco earthquake, common.topic.image, Post-and-Grant-Avenue
m.09x44m3, common.webpage.topic, San Francisco
m.05btf7t, award.award_honor.honored_for, San Francisco
m.09x3mn3, common.webpage.topic, San Francisco
m.09yp6yq, common.webpage.topic, San Francisco
1906 San Francisco earthquake, common.topic.image, San Francisco Fire Sacramento Street 1906-04-18
San Francisco, common.topic.webpage, m.09ychf9
m.03ll53z, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09xjwn2
m.09y22fm, common.webpage.topic, San Francisco
m.09y204d, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09x0gnt
San Francisco Fire Sacramento Street 1906-04-18, common.image.size, m.02c68gh
San Francisco, common.topic.webpage, m.09ylkyw
1906 San Francisco earthquake, book.book_subject.works, Locked Rooms
San Francisco, book.book_subject.works, The Barbary Plague: The Black Death in Victorian San Francisco
m.09xjwn2, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09ykksd
San Francisco, common.topic.webpage, m.0h2sfwg
Jack London, event.disaster_survivor.survived_disasters, 1906 San Francisco earthquake
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.written_work.author, Simon Winchester
m.09wjsz8, common.webpage.topic, San Francisco
Palace Hotel, San Francisco, event.disaster_affected_structure.destroyed_by_disaster, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09x70ns
San Francisco, common.topic.webpage, m.09xmh4d
1906 San Francisco earthquake, time.event.start_date, 1906-04-18T05:12:00
m.09y4yjk, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, Blue Light
m.09wtp9c, common.webpage.topic, San Francisco
m.09y632v, common.webpage.topic, San Francisco
http://www.sanfranciscosightseeing.com/, common.topic.subject_of, San Francisco
1906, common.topic.notable_types, Book
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, common.topic.notable_types, Book
m.09y39v1, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Bell Tower
San Francisco Fire Department Museum, travel.tourist_attraction.near_travel_destination, San Francisco
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.subjects, Photography
San Francisco, common.topic.webpage, m.09y60fg
Memory-Song Painted Gold: for the Blue Yusef Lateef (1920-2013), common.topic.subjects, San Francisco
San Francisco, common.topic.webpage, m.09w1w0k
San Francisco Mint (structure), event.disaster_affected_structure.survived_disasters, 1906 San Francisco earthquake
San Francisco, common.topic.webpage, m.09wg_8f
San Francisco, book.book_subject.works, Zodiac
San Francisco, common.topic.webpage, m.09yv5y4
1906, book.written_work.subjects, San Francisco
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.magnitude, m.02_w9xr
San Francisco, common.topic.webpage, m.0b48qmn
San Francisco, common.topic.webpage, m.09ydswz
m.09wyt0j, common.webpage.topic, San Francisco
San Francisco, book.book_subject.works, The Great Earthquake and Firestorms of 1906
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.date_and_time, 1906-04-18T13:12:00Z
m.09y9bqs, common.webpage.topic, San Francisco
1906 San Francisco earthquake, user.robert.earthquakes.earthquake.nearest_location, m.02_wb57
San Francisco, common.topic.webpage, m.03ll53z
San Francisco, film.film.starring, m.02h_4z3
San Francisco, common.topic.webpage, m.09y204d
m.0b46t1y, common.webpage.topic, San Francisco
m.0cj8mwt, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y39v1
San Francisco, book.book_subject.works, Listen to the silence
San Francisco, book.book_subject.works, Red Zone
After the Ruins, 1906 and 2006: Rephotographing the San Francisco Earthquake and Fire, book.written_work.author, Mark Klett
m.02_wb57, user.robert.earthquakes.earthquake_nearest_location.earthquake, 1906 San Francisco earthquake
Looking Down Sacramento Street, San Francisco, April 18, 1906, base.newsevents.photograph.photographer, Arnold Genthe
San Francisco, common.topic.webpage, m.09y9lh7
m.09yv5y4, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.02kpz3y
San Francisco Fire Sacramento Street 1906-04-18, common.image.appears_in_topic_gallery, 1906 San Francisco earthquake
San Francisco, film.film.runtime, m.03ljh3r
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.written_work.subjects, 1906 San Francisco earthquake
San Francisco, common.topic.image, San Francisco
San Francisco, common.topic.webpage, m.09w1wgb
m.09y978r, common.webpage.topic, San Francisco
A Crack in the Edge of the World: America and the Great California Earthquake of 1906, book.book.editions, The professor and the madman : a tale of murder, insanity, and the making of the Oxford English dictionary
San Francisco, common.topic.webpage, m.0b48njf
San Francisco, common.topic.webpage, m.09xh6pb
San Francisco, common.topic.webpage, m.09wtp9c
San Francisco, common.topic.webpage, m.0b6rdz3
San Francisco, common.topic.webpage, m.09yxjs0
San Francisco, common.topic.webpage, m.0b48bk0
San Francisco, common.topic.webpage, m.022q122
San Francisco, common.topic.webpage, m.09y92wl
m.09ychf9, common.webpage.topic, San Francisco
WWDC 2012, time.event.locations, San Francisco
m.09ykksd, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09ybmx4
San Francisco, book.book_subject.works, Scenarios
San Francisco, common.topic.webpage, m.09wm0d1
San Francisco, common.topic.webpage, m.09ykr7w
San Francisco, book.book_subject.works, Only in San Francisco
m.09w1w0k, common.webpage.topic, San Francisco
1906 San Francisco earthquake, event.disaster.areas_affected, San Francisco
m.0b46qyl, common.webpage.topic, San Francisco
San Francisco, common.topic.webpage, m.09y5d51
San Francisco, common.topic.webpage, m.09x3sv5
San Francisco, common.topic.webpage, m.09x3hrs
1906 San Francisco earthquake, time.event.locations, San Francisco
San Francisco, film.film.subjects, 1906 San Francisco earthquake
m.09ydswz, common.webpage.topic, San Francisco

Answer: 1906-04-18