Original issue, US Army Field Manual, 53 pages, size is 7 3/4" x 10 1/4", stapled, three hole punched, dated 4 Arpil 1966.  This is not a commercial copy or print but an original manual published in 1966 and republished in 1976 to include change 1.  Title of publication is -  FM 6-61, Field Artillery Battalion, Honest John.  Publication is designed to provide information and guidance for the employment of the Honest John battalion.  Illustrated using detailed and clear line drawings.