Aeronautics. New York. National Aeronautics Council, Inc. Office of publication, September 4, 1940

Aeronautics. New York. National Aeronautics Council, Inc. Office of publication, September 4, 1940, Volume: Gilbert C11. Robert L. Gilbert First Issues collection, Gilbert. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/525056 Accessed December 26, 2025.