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In page Percival Lowell:
"In 1930, Clyde Tombaugh, working at the Lowell Observatory, discovered Pluto near the location expected for Planet X. Partly in recognition of Lowell's efforts, a stylized P-L monogram (♇) – the first two letters of the new planet's name and also Lowell's initials – was chosen as Pluto's astronomical symbol.[1] However, it would subsequently emerge that the Planet X theory was mistaken.[citation needed]
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