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1
Measuremnt of speech levels in the presence of time varying background noise /
by Pearsons, Karl S.
Washington, D.C. : [Springfield, Va.] : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [For sale by the National Technical Information Service], 1982

Government Document Book
2
Community sensitivity to changes in aircraft noise exposure /
Washington, D.C. : [Springfield, Va.] : U.S. National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [For sale by the National Technical Information Service], 1981

Government Document Book
3
On the long range propagation of sound over irregular terrain /
by Howe, M. S.
Washington, D.C. : [Springfield, Va.] : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [For sale by the National Technical Information Service], 1984

Government Document Book
4
Propeller aircraft interior noise model /
by Pope, L. D.
Washington, D.C. : [Springfield, Va.] : National Aeronautics and Space Administration, Scientific and Technical Information Branch ; [For sale by the National Technical Information Service], 1984

Government Document Book
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