Original issue, US Army Technical Manual, 148 pages, size is 8 1/4" x 10 3/4", loose leaf, three hole punched, dated 7 April 1978. This is not a commercial copy or print but an original issue government print issued in 1978 and republished in 1981 to include changes 1 through 14. This publication is titled - TM 55-1520-235-10, Operators Manual for Army OH-58C Helicopter. This publication provides complete information and instructions for the operation of the OH-58C helicopter including operations under usual unusal conditions and emergency situations. Very well illustrated using detailed and clear line drawings.