Table:
0
A
B
C
D
E
1
Name
Built
Listed
Location
Borough
2
Alaska Central Railroad Tunnel No. 1
1906, 1916
1977-11-28
Seward
Kenai Peninsula
3
Lowell Creek Diversion Tunnel
1939, 1940
1977-11-23
Seward
Kenai Peninsula
4
Miles Glacier Bridge (Million Dollar Bridge)
1910
2000-03-31
Cordova
Valdez-Cordova (census area)
5
Susitna River Bridge
1920, 1921
1977-09-15
Gold Creek
Matanuska-Susitna
6
Grant Street Trestle
1906, 1927
removed 1988-03-10
Ketchikan
Ketchikan Gateway

Questions and formulas:
Question: What location was listed on 1977-09-15?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="1977-09-15"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,C2:C6="1977-09-15"),4))
Level: medium
Question: What is the Borough for the Seward listing on 1977-11-23?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,(D1="seward")*(C1="1977-11-23")),5))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,(D2:D6="seward")*(C2:C6="1977-11-23")),5))
Level: medium
Question: What location was listed on 1977-11-23?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="1977-11-23"),4))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,C2:C6="1977-11-23"),4))
Level: medium
Question: What are the listings in the Valdez-cordova (census area) Borough?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,E1="valdez-cordova (census area)"),3))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,E2:E6="valdez-cordova (census area)"),3))
Level: medium
Question: What is the name of the building listed on 1977-11-23?
Formula: UNIQUE(CHOOSECOLS(FILTER(A1:E1,C1="1977-11-23"),1))
Formula2: UNIQUE(CHOOSECOLS(FILTER(A2:E6,C2:C6="1977-11-23"),1))
Level: medium