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Clyde Tombaugh: Discoverer of Planet Pluto (Sky & Telescope Observer's Guides) by David H. Levy |
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Clyde Tombaugh and the Search for Planet X (Carolrhoda on My Own Book.) by Margaret K. Wetterer and Laurie A. Caple |
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Clyde Tombaugh (Kansas characters) by Dave Webb |
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Clyde Tombaugh and the Search for Planet X (On My Own Biographies (Paperback)) |
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Clyde William Tombaugh, 1906-1997 (Bulletin of the American Astronomical Society) by Reta Beebe |
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