This is the holy grail of New York World's Fair ephemera. "A colorful bird's-eye view of the Theme Center [showing] fairgoers entering the Perisphere from the Trylon and leaving by the Helicline" (World of Tomorrow p. 195). This poster was published in 1937, following the release of plans for the Trylon and Perisphere. It was not part of the later poster design competition, won by Joseph Binder. Culin was an architect who worked with Frost, Frost & Fenner, designers several pavilions for the fair.
Text at bottom reads "Copyright 1937, New York World's Fair 1939 Incorporated"
Swann Galleries in NYC has sold the 1/2 sheet 20 x 30 inch version of this poster on 2 occasions for over $6,000, they have sold the small 13 x 20 inch version for $3,250. They have NEVER had this one sheet version, we can find no other example of it in any World's Fair literature nor online.
A-condition, slight restoration to borders, old horizontal fold line.