Reference data : (seacoast artillery and antiaircraft artillery) - USA Coast Artillery Field Manual, FM 4-155 Elementry map and aerial photography reading - USA Voorschrift, Field Manual Advanced map and aerial photograph reading - USA Voorschrift, Field Manual, 21-26 Photomail operation - USA War Department Field Manual, FM 11-150 Advanced map and aerial photograph reading - USA Basic Field Manual, FM 21-26 Antiaircraft artillery : operation of matériel and employment of personnel, antiaircraft searchlight units - USA Coast Artillery Field Manual, FM 4-115 Aircraft proppellers - USA Voorschrift, Technical Manual, 1-412 Military intelligence : identification of U.S. government aircraft - USA Voorschrift, Basic Field Manual, 30-30 Facsimile sets AN/TXC-1, -1A and -1B - USA Voorschrift, Technical Manual, 11-2258 List of training publications - USA Basic Field Manual, FM 21-6 20-MM automatic gun M1 and 20-MM aircraft automatic gun AN-M2 : ordnance maintenance - USA Voorschrift, Technical Manual, 9-1227 Storage batteries for signal communication except those pertaining to aircraft - USA Voorschrift, Technical Manual, 11-430