Original issue, US Army Technical Manual, 38 pages, size is 8" x 10 1/4", stapled, three hole punched, dated 5 August 1963.  This is not a commercial copy or print but an original issue government print issued in 1963 and republished in1981.   This publication is titled - TM 3-1040-210-35, Field and Depot Maintenance for Compressor, Reciprocating, Power-Driven, Flamethrower, 3 1/2 CFM, AN-M4.  

Publication is designed to provide information and instructions for the repair and maintenance requirements and procedures for this compressor unit at the depot level of maintenance.  Very well illustrated using clear and detailed line drawings.