Militair 1982. London: Aviation Press Limited, 1982. Bridgman, Leonard. Jane's All The World's Aircraft 1956–57. New York: The McGraw-Hill Book Company, Inc., 1956. Harding, Stephen. U.S. Army Aircraft Since 1947. Shrewsbury, UK: Airlife Publishing, 1990. . Michell, Simon. Jane's Civil and Military Aircraft Upgrades 1994–95. Coulsdon, UK: Jane's Information Group, 1994. . Taylor, John W. R. Jane's All The World's Aircraft 1966–67. London: Sampson Low, Marston & Company, 1966. Taylor, John W. R. Jane's All The World's Aircraft 1967–68. London: Sampson Low, Marston & Company, 1967. Taylor, John W. R. Jane's All The World's Aircraft 1968–69. London: Sampson Low, Marston & Company, 1968. Taylor, John W. R. Jane's All The World's Aircraft 1969–70. London: Sampson Low, Marston & Company, 1969. Taylor, John W. R. Jane's All The World's Aircraft 1982–83. London: Jane's Yearbooks, 1982. . External links U-3 description at GlobalSecurity.org 310 1950s United States civil utility aircraft Low-wing aircraft Aircraft first flown in 1953 Twin piston-engined tractor aircraft Aircraft with counter-rotating propellers