[The economics of three-cent air mail;]
Subtitle: the volume of traffic and the level of postal rates as important factors in the development of domestic air transportation
By: by John Howard Payne.
Publisher: American University
Published: 1943
Place of publication: Washington, D.C
Language: eng
Number of pages: 78
Subjects: Air mail service -- United States.
Notes: Bibliography: leaf 67.
Thesis (M.A.)--American University, 1942.
Includes extra numbered leaves.
Reproduced from type-written copy.