Pneumatic mail tube systems.
Subtitle: Hearings before a subcommittee of the committee on the Post Office and Post Roads, House of Representatives, H. R. 6, H. R. 4450, H. R. 7400. Tuesday, June 18, 1935.
Publisher: U.S. Govt. print. off.
Published: 1935
Place of publication: Washington
Language: eng
Number of pages: 86
Subjects: Pneumatic-tube transportation; Postal service -- United States