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Holding Institution
- Free Library of Philadelphia15
- University of Pennsylvania13
- Ohio State University11
- University of California, Berkeley9
- Columbia University Rare Book & Manuscript Library4
- Cornell University4
- Western Michigan University4
- Harry Ransom Center3
- Newberry Library3
- Rutgers University3
- University of Chicago3
- Boston Public Library2
- Indiana University Bloomington1
- Lehigh University1
- Saint Louis University1
- Science History Institute1
- University of Kansas1
- University of Missouri1
- University of Rochester1
- Wellesley College1