MIL-S-18732D (NOTICE 1), MILITARY SPECIFICATION: STEEL BARS, WIRE, FORGING STOCK, FORGINGS, TUBING (431), SPECIAL QUALITY (19-MAR-1991)
MIL-S-18732D (NOTICE 1), MILITARY SPECIFICATION: STEEL BARS, WIRE, FORGING STOCK, FORGINGS, TUBING (431), SPECIAL QUALITY (19-MAR-1991).