20-MM aircraft gun matériel M1 and M2 - USA Voorschrift, Techincal Manual, 9-227 37-MM AA gun matériel, M1A2 - USA Voorschrift, Technical Manual, 9-235 Carbines, cal. .30, M1, M1A1, M2, and M3 - USA Voorschrift, Technical Manual, 9-1276 Field artillery : Gunnery - USA Field Manual, FM 6-40
