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- Princeton University Library: Manuscripts Division85
- Swarthmore College Peace Collection26
- University of Pennsylvania: Kislak Center for Special Collections, Rare Books and Manuscripts26
- Science History Institute Archives13
- Princeton University Library: Public Policy Papers10
- Haverford College Quaker & Special Collections8
- Philadelphia Museum of Art Archives6
- Historical Society of Pennsylvania2
- Bryn Mawr College1
- Princeton University Library: University Archives1
- Temple University Libraries Special Collections Research Center1
- The Historical and Interpretive Collections of The Franklin Institute1