MIL-STD-693C (NOTICE 1), MILITARY STANDARD: LOCOMOTIVE, ROAD AND SWITCHER, DOMESTIC AND FOREIGN SERVICE (02 SEP 1981) [NO S/S DOCUMENT]
MIL-STD-693C (NOTICE 1), MILITARY STANDARD: LOCOMOTIVE, ROAD AND SWITCHER, DOMESTIC AND FOREIGN SERVICE (02 SEP 1981) [NO S/S DOCUMENT].