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The Rare Book Detective: books, type, watermarks: Unicorn
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The Rare Book Detective: books, type, watermarks: Unicorn
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The Rare Book Detective: books, type, watermarks: 1783 Top half of unicorn
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The Rare Book Detective: books, type, watermarks: 1783 bottom half of unicorn
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The Rare Book Detective: books, type, watermarks: 1576 unicorn watermark
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The Rare Book Detective: books, type, watermarks: 1576 unicorn watermark