See also References Notes Bibliography Andrade, John. Militair 1982. London: Aviation Press Limited, 1982. . Frawley, Gerald. "Convair CV-540, 580, 600, 640 & CV5800", The International Directory of Civil Aircraft 1997/98. Fyshwick ACT: Aerospace Publications, 1997. . Gradidge, Jennifer. The Convairliners Story. Tonbridge, Kent, UK: Air-Britain (Historians) Ltd, 1997. . Swanborough, F. G. and Peter M. Bowers. United States Military Aircraft since 1909. London: Punam, 1963. Wegg, John. General Dynamics Aircraft and Their Predecessors. London: Putnam, 1990. . External links Convair 240 – National Air and Space Museum C-131 Samaritan factsheet – National Museum of the United States Air Force C-131D Samaritan – March Field Air Museum C-131 Samaritan – GlobalSecurity.org C-131 Samaritan – The Aviation Zone Gunships – The Aviation Zone C-131 1950s United States military trainer aircraft C-0131 Samaritan Low-wing aircraft Aircraft first flown in 1949 Twin piston-engined tractor aircraft Aircraft related to spaceflight