In 1945 the Applied Physics Laboratory of Johns Hopkins University, in a project for the U.S. Navy Bureau of Ordnance, established a testing laboratory for ram jet motors at Forest Grove, Maryland in relatively open country where high noise levels could be tolerated.
W. B. Snow; Quieting Ram Jets. Physics Today 1 December 1949; 2 (12): 33. https://doi.org/10.1063/1.3066343
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