Columbia subject headings:
New York World's Fair (1939-1940 : New York, N.Y.).
Harvard subject headings:
New York World's Fair (1939-1940 : New York, N.Y.)
New York World's Fair (1939-1940 : New York, N.Y.)--Poland.
Princeton subject headings:
New York World's Fair (1939-1940 : New York, N.Y.)