Uniform system of accounts for carriers by air.
Subtitle: Prescribed by the Post office department for air mail carriers.  First issue.  Approved July, 1930.
Publisher: U.S. Govt. print. off.
Published: 1931
Place of publication: Washington
Language: eng
Number of pages: 100
Subjects: Air mail service -- United States.
Notes: At head of title:  "United States Post office department.  Second assistant postmaster general.  Division of air mail service.