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Clyde Tombaugh at a Zeiss Blink Comparator
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Clyde Tombaugh at door of 13 inch Telescope
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Harvard College Observatory Announcement Card 108
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Harvard College Observatory Announcement Card 121
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Harvard College Observatory Announcement Card 133
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Letter suggesting the name Latona for newly discovered planet
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Letter suggesting the name Pluto for newly discovered planet
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Letter suggesting the name Utopia for newly discovered planet
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