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Holding Institution
- Free Library of Philadelphia85
- New York University49
- Harry Ransom Center26
- Indiana University, Bloomington17
- University of Pennsylvania13
- Boston Public Library9
- Western Michigan University7
- Princeton University5
- Rutgers, The State University of New Jersey4
- State of California4
- University of Kansas3
- Science History Institute2
- Grolier Club1
- Nelson-Atkins Museum of Art1
- University of Oregon1