Air transportation in the United States
Subtitle: its growth as a business
By: by Hugh Knowlton
Publisher: The University of Chicago Press
Published: 1941
Place of publication: Chicago, Ill
Language: eng
Number of pages: 72
Subjects: Commercial Aeronautics
Notes: Microfilm. New York, N.Y., Columbia University Libraries, 1996. 1 microfilm reel, 35 mm.

Filmed; NEH Project (FMEST); 1996.