Ground instructor's manual.
Subtitle: September, 1940.
Series: Its Civil aeronautics bulletin; no. 30
Publisher: U.S. Govt. print. off.
Published: 1940
Place of publication: Washington
Language: eng
Number of pages: 51
Subjects: Aeronautics -- Study and teaching.
Notes: At head of title:  United States Dept. of commerce.  Civil aeronautics administration, Washington, D.C.