Operator's and Organizational Maintenance Manual 1966 TM 11-5840-293-12 Radar Set AN/FPN-40 (with IFF Capability ), approx 200 pages, measures 8.25" x 10.75." (this is a Reprint with changes 1-4) manual is in very good condition - covers and pages show slight signs of usage, held together by two heavy duty staples.