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Holding Institution
- University of Missouri22
- Ohio State University11
- Rochester Institute of Technology7
- The Huntington Library, Art Museum, and Botanical Gardens6
- Free Library of Philadelphia5
- Cornell University4
- Indiana University Bloomington4
- University of Pennsylvania4
- University of California, Berkeley3
- Harry Ransom Center2
- Newberry Library2
- Princeton University2
- New York University1
- Rutgers University1
- Saint Louis University1
- University of California, Davis1
- Western Michigan University1