Harrison, R. T. (1974). Motorcycle noise. San Dimas, CA: U.S.D.A. Forest Service, Equipment Development Center.
Abstract
Measures noise levels of various 1970-1975 model year motorcycles using the SAE J331 test. Describes the elaborate work and instrumentation needed to establish SPL before the advent of “sound meters” used today. Recommends all FS employees operating motorcycles wear hearing protection.
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