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Lubos Kohoutek - Commemorative Sheet With First Day Cancellation Circa 1967 co-signed by: James A. Van Allen, Clyde William Tombaugh | HistoryForSale Item 217519
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Clyde William Tombaugh - First Day Cover Signed co-signed by: Fred Lawrence Whipple, Lubos Kohoutek | HistoryForSale Item 79562
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