Levy, David H., 1948- Clyde Tombaugh : discoverer of planet Pluto / David H. Levy.

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Levy, David H., 1948-

Clyde Tombaugh : discoverer of planet Pluto / David H. Levy.

Tombaugh, Clyde William, 1906-1997

Astronomers -- United States -- Biography.

Pluto (Planet)