The story of the young farm boy who became an astronomer and discovered the planet Pluto at the age of twenty-four.

Clyde Tombaugh and the Search for Planet X 1996, Carolrhoda Books, Minneapolis, MN

ISBN-13: 9780876148938

Hardcover

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Clyde Tombaugh and the Search for Planet X 1996, Carolrhoda Books, Minneapolis, MN

ISBN-13: 9780876149690

Trade paperback

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