Service of the piece 105-mm Howitzer, M 2, truck-drawn - USA Field Artillery Field Manual, FM 6-75 Service of the piece 8-inch Howitzer M 1 - USA Field Artillery Field Manual, FM 6-91 Field artillery : tactics and technique of division artillery and higher artillery echelons - USA War Department Field Manual, FM 6-100 Photomail operation - USA War Department Field Manual, FM 11-150 Advanced map and aerial photograph reading - USA Basic Field Manual, FM 21-26 Examination for gunners - USA Antiaircraft Artillery Field Manual, FM 4-119 Service of the piece : 105-MM howitzer self-propelled - USA Armored Force Field Manual, FM 17-63 Assault gun section and platoon - USA Armored Force Field Manual, FM 17-25 united states army in world war ii Washington command post : the operations division / by Ray S. Cline united states army in world war ii Logistical support of the armies / by Roland G. Ruppenthal united states army in world war ii Chief of staff : prewar plans and preparations / by Mark Skinner Watson united states army in world war ii organization and role of the Army sevice forces / by John D. Millett