MIL-STD-1621A, MILITARY STANDARD: ACOUSTICAL AND VIBRATIONAL STANDARD REFERENCE QUANTITIES (27 AUG 1973) [NO S/S DOCUMENT]

MIL-STD-1621A, MILITARY STANDARD: ACOUSTICAL AND VIBRATIONAL STANDARD REFERENCE QUANTITIES (27 AUG 1973) [NO S/S DOCUMENT]., This standard covers reference quantities to be used in reporting of all acoustical and vibrational quantities expressed in terms of levels.