Number 761-723 Piper Navajo Pilot's Operating Manual, Revision 34, April 22nd 2002. Piper Aircraft Corporation, Manual Part Number 761-456 Piper T1020 Parts Catalog, Revision 10, September 10, 2009. Piper Aircraft Corporation, Manual Part Number 761-775 Sixma, Herman J. and Jyrki Laukkanen. "Far Northern Air Force: The Finnish Air Arm Today". Air International, July 1986, Vol. 31, No. 1. pp. 7–13. . Taylor, John W. R. Jane's All The World's Aircraft 1976–77. London: Jane's Yearbooks, 1976, . Taylor, John W. R. Jane's All The World's Aircraft 1982–83. London: Jane's Yearbooks, 1982, . Wheeler, Barry C. "World's Air Forces 1979". Flight International, 4 August 1979, Vol. 116, No. 3672. pp. 333–386. 1960s United States civil utility aircraft Aircraft first flown in 1964 Low-wing aircraft Navajo Twin piston-engined tractor aircraft