MIL-STD-621A, MILITARY STANDARD: SUBGRADE, SUBBASE, AND TEST METHOD FOR PAVEMENT BASE-COURSE MATERIALS (22 DEC 1964) [NO S/S DOCUMENT]

MIL-STD-621A, MILITARY STANDARD: SUBGRADE, SUBBASE, AND TEST METHOD FOR PAVEMENT BASE-COURSE MATERIALS (22 DEC 1964) [NO S/S DOCUMENT]., This standard was developed to establish methods of testing materials for use as subgrade, subbase, and base course for pavement in those instances not covered by American Society for Testing and Materials (ASTM) tests or American Association of State Highway Officials (AASHO) procedures,or where tests for which the procedure required by the military services differs from that prescribed by ATM or AASHO.