Question: The 1939 New York World's Fair was exceedd in expanse only by another fair which was held in St. Louis , Missouri during what dates?
Sentence (from "1939 New York World's Fair"): The 1939–40 New York World's Fair, which covered the 1216 acre of Flushing Meadows-Corona Park (also the location of the 1964–1965 New York World's Fair), was the second most expansive American world's fair of all time, exceeded only by St. Louis's Louisiana Purchase Exposition of 1904.
Relevant evidence: Yes