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J. Percy Moore papers, 1847-1963 (inclusive)

Held at: Academy of Natural Sciences, Philadelphia [Contact Us]

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Morse Peckham manuscript for variorum text of The Origin of Species by Charles Darwin, circa 1959

Held at: University of Pennsylvania: Kislak Center for Special Collections, Rare Books and Manuscripts [Contact Us]

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John Muirhead Macfarlane writings, 1922-1929 (inclusive)

Held at: University of Pennsylvania: Kislak Center for Special Collections, Rare Books and Manuscripts [Contact Us]

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Carlludwig Franck unpublished writings, 1952-1983 (inclusive)

Held at: University of Pennsylvania: Kislak Center for Special Collections, Rare Books and Manuscripts [Contact Us]

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Edwin Grant Conklin Papers, 1897-1952 (inclusive)

Held at: Princeton University Library: Manuscripts Division [Contact Us]