Service of the piece : 155-MM gun M2 : truck-drawn and tractor-drawn - USA War Department Field Manual, FM 6-90 Notes for field artillery replacement centers - USA Voorschrift, Technical Manual, 6-600 Service of the piece : 75-mm gun M 2 A 3, truck-drawn and horse-drawn - USA Field Artillery Field Manual, FM 6-56 Service of the piece : 155-mm gun M 1 - USA Field Artillery Field Manual, FM 6-90 Drill regulations for light artillery Drill regulations for field artillery Drill and Service Regulations for Field Artillery (Horse and Light) : Volume I : Parts I, II, and III Drill and Service Regulations for Field Artillery (Horse and Light) : Volume II : Parts IV, V, VI, VII, and VIII. Field artillery - USA Voorschrift, Training Regulations, No. 430 Field artillery : Special field artillery vehicles - USA Voorschrift, Technical Regulations, No. 1305-A Tactics instruction memorandum : Tactical Aspects of Field Artillery Fire Direction Materiel instruction memorandum : Sighting and laying equipment for field artillery materiel