Stringfield, Leonard H.; Tombaugh, Clyde William, 1906-1997; Menzel, Donald H. (Donald Howard), 1901-1976
Unidentified flying objects; Tombaugh, Clyde William, 1906-1997; Evidence; Newsletters; White Sands Missile Range (N.M.); Research; Keyhoe, Donald E. (Donald Edward), 1897-1988; Belief and doubt
Tombaugh, Clyde William, 1906-1997; Nicolaisen, Edilfe; Norwine, James R.; Pasachoff, Jay M.; Pittinger, P. D.; Pruett, J. Hugh; Schumacher, Heinrich; Sparks, John C.; Stockman, Victor E., Mrs.; Swihart, Ernest W. (Ernest Walter), 1942-.; Wright,...
Clippings (Books, newspapers, etc.); Satellites; Errors; Unidentified flying objects--Sightings and encounters; Tombaugh, Clyde William, 1906-1997; Publishers and publishing; Spiritual life--New Age movement; Lorenzen, Coral E., 1925-; Unidentified...
Keyhoe, Donald E. (Donald Edward), 1897-1988; Tombaugh, Clyde William, 1906-1997
Unidentified flying objects; Governmental investigations; Life on other planets; Life on other planets--Possibility; Satellites; Satellites--Research; Publications; Artificial satellites; Soviet Union; Earth (Planet); Space flight; Spectrograph;...
Jara, Alejandro de la; Tombaugh, Clyde William, 1906-1997
Moon; Lunar craters; Mare Crisium (Moon); Unidentified flying objects; Amateur astronomy; Mars (Planet); Mars (Planet)--Research; Life on other planets; Project Blue Book (U.S.); Space flight; Satellites; Geology; Expertise; Life on other...
Tombaugh, Clyde William, 1906-1997; Arnold, G. P.; Breck, Louis W.; Brown, T. Townsend; Carrouges, Michel, 1910-1988; Collings, Fred; Coyne, Dolores M., Mrs.; Daughters, Dave; Egan, John D., Jr.; Fawcett, George D.; Davis, Marion N.; Gariety,...
Unidentified flying objects; Tombaugh, Clyde William, 1906-1997; Literature and myth; Hypothesis; Visual perception; Possibility; Unidentified flying objects--Sightings and encounters; Apologies; Language and languages; Manuscripts; Belief and...