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Holding Institution
- Free Library of Philadelphia15
- Ohio State University11
- University of Pennsylvania10
- University of California, Berkeley5
- Columbia University Rare Book & Manuscript Library4
- Cornell University4
- Newberry Library3
- University of Chicago3
- Western Michigan University3
- Boston Public Library2
- Harry Ransom Center2
- Rutgers University2
- Indiana University Bloomington1
- Saint Louis University1
- Science History Institute1
- University of Kansas1
- University of Missouri1
- Wellesley College1