A paperback copy of a Vietnam War Era Department of the Army Issued FM 23-90 "81-MM Mortar" c.1972 in fair to good overall condition. Small scattered stains from contact with moisture likely in the field. Department of the Army Field Manual FM 23-90 ("81-MM Mortar") was a comprehensive military training publication used during the Vietnam War. . It instructed infantrymen on the mechanical operation, maintenance, tactical employment, and firing procedures of the M29 and M29A1 81-mm medium mortars. The manual served as the primary guide for mortar squads and infantry officers. Bidders are welcome to preview items in person during our normal operating hours Tuesday through Saturday 11am-6pm. Estimated shipping parcel size (LxWxH) 14 inches x 12 inches x 4 inches. Please note, shipping estimates are provided for LiveShipping calculations only and may vary based on weight and location. The auction house will combine multiple lots to reduce shipping cost. Please inform the auction house prior to paying your invoice for special shipping requests. Our primary method of shipping is via UPS Ground.