also References Notes Bibliography Angelucci, Enzo. The Rand McNally Encyclopedia of Military Aircraft, 1914–1980. San Diego, California: The Military Press, 1983. . Baugher, Joe. "Boeing P-12". American Military Aircraft, 6 June 1998. Retrieved: 10 June 2011. Bowers, Peter M. Boeing Aircraft since 1916. London: Putnam Aeronautical Books, 1989. . Bowers, Peter M. The Boeing P-12E. Number 2, Profile Publications Wallick, Lew. "Boeing 100: An Admirable Airworthy Antique". Air Enthusiast, No. 9, February–May 1979, pp. 1–9. . External links P-12 fact sheet at the National Museum of the United States Air Force Joe Baugher's P-12 History Page The Boeing P-12/F4b picture page Boeing F4B US Navy Version P-12 Boeing P-12 Biplanes Single-engined tractor aircraft Aircraft first flown in 1928