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- Princeton University Library: Manuscripts Division131
- Haverford College Quaker & Special Collections62
- Princeton University Library: Public Policy Papers31
- Princeton University Library: University Archives18
- Philadelphia Archdiocesan Historical Research Center12
- Free Library of Philadelphia: Rare Book Department10
- Academy of Natural Sciences, Philadelphia8
- Library Company of Philadelphia7
- Bryn Mawr College6
- Chester County Historical Society5
- Drexel University: College of Medicine Legacy Center5
- Historical Society of Pennsylvania5
- Independence Seaport Museum, J. Welles Henderson Archives and Library5
- German Society of Pennsylvania: Joseph P. Horner Memorial Library4
- Friends Historical Library of Swarthmore College2
- Pennsylvania Horticultural Society2
- Philadelphia Museum of Art Archives2
- Temple University Libraries Special Collections Research Center2
- Wagner Free Institute of Science2
- City of Philadelphia, Department of Records, City Archives1