Ask Mr. Foster; 50th Anniversary Golden Jubilee. New York, N.Y.: Ask Mr. Foster Travel Service Inc., 1938

Ask Mr. Foster; 50th Anniversary Golden Jubilee. New York, N.Y.: Ask Mr. Foster Travel Service Inc., 1938, Volume: Gilbert D103. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525223 Accessed December 27, 2025.