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Derso and Kelen Collection, 1922-1982 (inclusive) 1922-1970 (bulk)
Held at: Princeton University Library: Public Policy Papers [Contact Us]
Held at: Princeton University Library: Public Policy Papers [Contact Us]
Held at: Princeton University Library: Public Policy Papers [Contact Us]
Held at: Princeton University Library: Public Policy Papers [Contact Us]
Held at: Princeton University Library: Public Policy Papers [Contact Us]
Held at: German Society of Pennsylvania: Joseph P. Horner Memorial Library [Contact Us]
Held at: Delaware County Historical Society [Contact Us]
Held at: Science History Institute Archives [Contact Us]
Held at: Science History Institute Archives [Contact Us]
Held at: Science History Institute Archives [Contact Us]
Held at: University of Pennsylvania: Kislak Center for Special Collections, Rare Books and Manuscripts [Contact Us]