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Holding Institution
- Harry Ransom Center41
- The Huntington Library, Art Museum, and Botanical Gardens16
- University of Chicago9
- Newberry Library5
- University of California, Berkeley4
- University of Missouri3
- Boston Public Library2
- New York University2
- General Theological Seminary1
- Harvard University1
- Indiana University Bloomington1
- Princeton University1
- Science History Institute1
- University of Pennsylvania1