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Holding Institution
- Free Library of Philadelphia14
- Ohio State University11
- University of Pennsylvania4
- Cornell University3
- Harry Ransom Center3
- Newberry Library3
- University of California, Berkeley3
- Western Michigan University3
- Boston Public Library2
- University of Chicago2
- Indiana University Bloomington1
- Rutgers University1
- Saint Louis University1
- Science History Institute1
- University of Kansas1
- University of Missouri1
- Wellesley College1