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Holding Institution
- The Huntington Library, Art Museum, and Botanical Gardens12
- Harvard University10
- Newberry Library10
- University of California, Berkeley8
- University of Pennsylvania3
- Grolier Club2
- Conception Abbey and Seminary1
- Free Library of Philadelphia1
- Harry Ransom Center1
- Ohio State University1
- University of Chicago1
- University of Kansas1
- University of Missouri1
- Vassar College1