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Holding Institution
- Free Library of Philadelphia122
- University of Pennsylvania108
- The Huntington Library, Art Museum, and Botanical Gardens46
- Harvard University43
- University of California, Berkeley24
- Newberry Library7
- Saint Louis University4
- Bryn Mawr College3
- Princeton University3
- Vassar College3
- Columbia University Rare Book & Manuscript Library2
- Science History Institute1