Question: What number is the series of "Oz" books does the City of Thi appear in?

Context articles: Jinnicky the Red Jinn
Vietnamese Prodigy
The Marvelous Land of Oz
Land of Ev
City of Thi
The Emerald City of Oz
List of Oz books
The Nine Tiny Piglets
Yankee in Oz
The Lost Princess of Oz

The Red Jinn, later known as Jinnicky, is one of Ruth Plumly Thompson's most frequently occurring characters in her Oz books.
 He was first introduced in "Jack Pumpkinhead of Oz" as a mysterious figure who educates Jack Pumpkinhead on the use of the Pirate Sack.
 Although a detailed description is included in the text, "Jack Pumpkinhead of Oz" includes no illustrations of the Red Jinn aside from a gruesome color plate that did not appear outside the first edition, in which he has massive piercings.
 He was reintroduced, drawn, and given the name Jinnicky in "The Purple Prince of Oz"; he also appeared in the follow-up, "The Silver Princess in Oz".
 (He makes a cameo appearance in "The Wishing Horse of Oz", and he is the principal pre-existing character in Thompson's sub-canonical penultimate Oz book, "Yankee in Oz").
 Jack Snow apparently thought the Red Jinn was a separate character, for he considered "The Purple Prince of Oz" Jinnicky's first appearance in "Who's Who in Oz", though he did not include a separate Red Jinn entry.
Vietnamese prodigy (Vietnamese : "Thần đồng đất Việt") is a comic series of Vietnam, the first volume called 'Shaman calls grapefruit' published by Tre Publishing House in February 16, 2002.
 Initially the work was carried out by Le Linh and Phan Thi company.
 After writing the story for a while, Le Linh stopped writing this comic, and now writing stories as well as related work are in charge by Phan Thi company.
 The series previously published by Tre Publishing House, followed Van Hoa Sai Gon Publishing House, Thoi Dai Publishing House(from episode 130 to episode 153), Dai Hoc Su Pham Ho Chi Minh City Publishing House (from episode 154 to episode of 168) and now the Dan Tri Publishing House (from episode 169 onwards).
 With over 100 novels, along with related comic Vietnamese Science prodigy, Vietnamese Fine Arts Prodigy and the Vietnam Mathematics prodigy, Vietnamese Prodigy Hoang Sa-Truong Sa, which is considered the Vietnam comics longest and most successful until the present time.
 Average one volume per month of Vietnamese Prodigy (printed in black and white) and three new color comics related Vietnamese Prodigy (including Science, Mathematics and Fine Arts) was released.
The Marvelous Land of Oz: Being an Account of the Further Adventures of the Scarecrow and the Tin Woodman, commonly shortened to The Land of Oz, published on July 5, 1904 , is the second of L. Frank Baum's books set in the Land of Oz, and the sequel to "The Wonderful Wizard of Oz" (1900).
 This and the next 34 Oz books of the famous 40 were illustrated by John R. Neill.
 The book was made into an episode of "The Shirley Temple Show" in 1960, and into a Canada/Japan co-produced animated series of the same name in 1986.
 It was also adapted in comic book form by Marvel Comics, with the first issue being released in November 2009.
 Plot elements from "The Marvelous Land of Oz" are included in the 1985 Disney feature film "Return to Oz".
The Land of Ev is a fictional country in the Oz books of L. Frank Baum and his successors.
 Its exact location is unclear between text and maps. "
The Road to Oz" states that Ev is to the north of the Land of Oz, and in "Ozma of Oz", Princess Ozma of Oz and her procession enter the Munchkin Country and meet the King of the Munchkins upon leaving the palace at Evna, the capital city.
 Subsequent books place Ev nearer to the Winkie Country, and the map on the endpapers of "Tik-Tok of Oz" shows the Munchkin Country as having no northern border with the desert that surrounds Oz, as a thin strip of the Gillikin Country extends even farther east than most of the Munchkin Country.
 This map depicts Ev as a small country to the northwest (the compass rose is reversed) of Oz, with the Dominions of the Nome King as a separate area.
 James E. Haff and Dick Martin's map, following the text, place the Nome Kingdom under an Ev that takes up the entire portion allotted to the Nome King's dominions on Baum's map.
The City of Thi is a fictional city in the Winkie Country of the Land of Oz, from the Oz Books by L. Frank Baum.
 Thi appears in the book "The Lost Princess of Oz".
The Emerald City of Oz is the sixth of L. Frank Baum's fourteen Land of Oz books.
 It was also adapted into a Canadian animated film in 1987.
 Originally published on July 20, 1910, it is the story of Dorothy Gale and her Uncle Henry and Aunt Em coming to live in Oz permanently.
 While they are toured through the Quadling Country, the Nome King is assembling allies for an invasion of Oz.
 This is the first time in the Oz series that Baum made use of double plots for one of the books.
The Oz books form a book series that begins with "The Wonderful Wizard of Oz" (1900) and relate the fictional history of the Land of Oz.
 Oz was created by author L. Frank Baum, who went on to write fourteen full-length Oz books.
 All of the Baum written books are in the public domain in the United States.
 Even while he was alive, Baum was styled as "the Royal Historian of Oz" to emphasize the concept that Oz is an actual place.
 The illusion created was that characters such as Dorothy and Princess Ozma related their adventures in Oz to Baum themselves, by means of wireless telegraph.
The Nine Tiny Piglets are characters in the Oz series.
 They first appear in "Dorothy and the Wizard in Oz", owned by the Wizard of Oz and used for a trick in which he uses sleight of hand to make it appear as if he is pulling apart the piglets to make them appear, and pushing them together again to make them disappear.
 He uses this trick to deceive the Mangaboos.
Yankee in Oz is a 1972 Oz novel by Ruth Plumly Thompson.
 It was the first published by The International Wizard of Oz Club.
 A letter from the Henry Regnery Company, which bought Reilly & Lee, is reproduced in the front indicating the publisher's blessing for the new Oz book to appear.
 It was originally written in 1959, but because the Oz books were not selling, it was not published.
 The first two editions of the book were published in 8½ x 11 inch format and running only 94 pages.
 This was done at the request of illustrator Dick Martin to reduce the number of required illustrations and to show them closer to the actual size they were drawn.
 The second printing (1986) featured a new cover, with the first edition artwork reprinted preceding the title page.
 The third printing (2007) is standard Oz book size.
 Its cover is a gaudier redesign of the second edition cover.
 The book also features maps by James E. Haff, and as such, Thompson correctly places the Winkie Country in the west of Oz.
The Lost Princess of Oz is the eleventh canonical Oz book written by L. Frank Baum.
 Published on June 5, 1917, it begins with the disappearance of Princess Ozma, the ruler of Oz and covers Dorothy and the Wizard's efforts to find her.
 The introduction to the book states that its inspiration was a letter a little girl had written to Baum: "I suppose if Ozma ever got hurt or losted, everybody would be sorry."