Original issue, US Army Field Manual, 33 pages, size is 8" x 10 1/4", stapled, three hole punched, dated 6 Janaury 1966.  This is not a commercial copy or print but an original issue government print issued in 1966.  This publication is titled - FM 23-23, Antipersonnel Mine M18A1 and M18 (Claymore).  Publication is designed to provide information and instructions for the use and operation of the Claymore.  Very well illustrated using photorgaphs and line drawings.