Tombaugh, Clyde William, 1906-1997; Allen, Charles E. III; Allen, George E.; McNamara, Bernard; Alyn, Scott; Andever, Michael; Johnston, Howard W.; Anderson, Christopher M.; Johnston, Howard W.
Publications; Pluto (Dwarf planet); Thank-you notes; Pluto (Dwarf planet)--Orbits; Charon (Satellite); Planets; Invitation cards; Apologies; Schedules; Amateur astronomy; Allen, Charles E. III; Speeches, addresses, etc.; Congresses and conventions;...
Tombaugh, Clyde William, 1906-1997; Campbell, James Kenneth; Christie, William H.; Christy, James W., 1938-; Comeau, Paul T., 1926-2019; Crowder, W. E., Jr.; Cruikshank, Dale P.; Custer, Clarence P.