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Holding Institution
- Free Library of Philadelphia229
- Princeton University223
- University of Pennsylvania62
- The Huntington Library, Art Museum, and Botanical Gardens42
- University of California, Berkeley22
- Harvard University19
- Saint Louis University16
- Bryn Mawr College6
- Science History Institute5
- Newberry Library4
- Wellesley College4
- Western Michigan University4
- Cornell University1
- University of Dayton1
- University of Oregon1