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Holding Institution
- Free Library of Philadelphia212
- University of Pennsylvania121
- The Huntington Library, Art Museum, and Botanical Gardens55
- Harvard University44
- University of California, Berkeley27
- Cornell University18
- Newberry Library9
- Bryn Mawr College5
- Princeton University4
- Saint Louis University4
- Vassar College3
- Columbia University Rare Book & Manuscript Library2
- Science History Institute1