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Holding Institution
- Harvard University48
- University of Pennsylvania31
- Boston Public Library19
- Free Library of Philadelphia18
- University of California, Berkeley7
- Columbia University Rare Book & Manuscript Library6
- Newberry Library5
- Cornell University3
- Princeton University3
- The Huntington Library, Art Museum, and Botanical Gardens2
- Williams College2
- Bryn Mawr College1
- Science History Institute1
- University of Chicago1
- University of Oregon1