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David Spence: Guayule Rubber Project Records, 1910-1951 (inclusive) 1926-1946 (bulk)
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]
Held at: Princeton University Library: Public Policy Papers [Contact Us]
Held at: Princeton University Library: Manuscripts Division [Contact Us]