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Holding Institution
- University of Pennsylvania200
- Harvard University72
- Boston Public Library23
- Free Library of Philadelphia18
- University of California, Berkeley12
- Columbia University Rare Book & Manuscript Library11
- Newberry Library6
- Princeton University4
- Cornell University3
- The Huntington Library, Art Museum, and Botanical Gardens3
- Williams College3
- University of Chicago2
- Bryn Mawr College1
- Science History Institute1
- University of Kansas1
- University of Oregon1