Noise characteristics of eight helicopters /
Harold C. True and E. J. Rickley.

APA Citation

True, H. C., Transportation Systems Center., United States. Federal Aviation Administration. Systems Research and Development Service. (1977). Noise characteristics of eight helicopters. Washington: Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service .

MLA Citation

True, Harold C, Transportation Systems Center, and United States. Federal Aviation Administration. Systems Research and Development Service. Noise Characteristics of Eight Helicopters. Washington: Dept. of Transportation, Federal Aviation Administration, Systems Research & Development Service , 1977.