Smithsonian Magazine had an article about
Libraries' Suprising Special Collections. They didn't put links to any of them, though, so someone found links and posted them in Metafilter as
Treasures Unburied. Then people started adding comments with their own links. Fun stuff!
Here are some of my favorites:
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Fore-edge paintings at Boston Public
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Nurse Romance Covers at University of Wisconsin-Milwaukee
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Ad*Access at Duke University
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Emergence of Advertising in America at Duke University