Identification and proposed control of helicopter transmission noise at the source
By: John J. Coy ... [et al.].
Contributors: Coy, John J.; United States. National Aeronautics and Space Administration.
Series: NASA TM -- 89312; USAAVSCOM-TR- -- 87-C-2; NASA technical memorandum -- 89312.; AVSCOM technical report -- 86-C-41.
Publisher: National Aeronautics and Space Administration
Published: 1987
Place of publication: [Washington, D.C.]
Language: eng
Format: Microform
Subjects: Helicopters -- Noise.
Notes: Distributed to depository libraries in microfiche.

Microfiche. [Washington, D.C.? : National Aeronautics and Space Administration], 1987. 1 microfiche.