Amazon.com description: Product Description: Chosen by the U.S. Army in 1950 to replace its aging fleet of L-4 and L-5 aircraft, the Cessna L-19/O-1 Bird Dog was the first all-metal high-wing aircraft to serve the Army. Over 3,000 of these aircraft were built in 5 different models, also serving the U.S. Navy, Marine Corps, and Air Force in the liaison, training, and observation roles, with many supplied to foreign nations. More than 100 photos, 10 color profiles, black-and-white line drawings, color covers. 50 pages.