Abbreviated firing tables - USA Voorschrift, Technical Manual, 6-215 Browning machine gun, caliber .30, HB M1919A4, ground - USA Basic Field Manual, FM 23-45 Browning machine gun, caliber .30, HB, M1919A4, ground - USA Basic Field Manual, FM 23-45 Regulations prescribing standard for field firing and the proficiency test
