Rotary-wing and disk-rotor aircraft
Subtitle: report (to accompany S. 3976)
Series: Report / 75th Congress, 3d session, Senate -- no. 2081
Publisher: U.S. G.P.O.
Published: 1938
Place of publication: Washington, D.C.?
Language: eng
Subjects: Appropriations and expenditures
Notes: Caption title.

"June 7 ... 1938."