Books by R. Hellman:
Books in the extended shelves:
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Hellman, R.: Comparison of various methods for predicting the loudness and acceptability of noise (U.S. Environmental Protection Agency, 1977), also by Benjamin Scharf, J. Bauer, United States Office of Noise Abatement and Control, and Mass.). Auditory Perception Laboratory Northeastern University (Boston (page images at HathiTrust)
Find more by R. Hellman at your library, or elsewhere.