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Buffington–Marshall papers, 1707-1876 (inclusive)

Held at: Chester County Historical Society [Contact Us]

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Samuel C. (Samuel Copeland) Palmer Papers, 1895-1957 (inclusive)

Held at: Friends Historical Library of Swarthmore College [Contact Us]

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William Curtis papers, 1946

Held at: Haverford College Quaker & Special Collections [Contact Us]

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Graceanna Lewis natural history papers, 1869-1890 (bulk) 1869-2006 (inclusive)

Held at: Delaware County Institute of Science [Contact Us]

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T. Chalkley Palmer natural science teaching collection, circa 1880-1930

Held at: Delaware County Institute of Science [Contact Us]

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Harold W. Arndt papers of the Delaware County Institute of Science, Geological and Mineralogical Section, 1938-1942 (inclusive)

Held at: Delaware County Institute of Science [Contact Us]

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Delaware County Institute of Science herbaria collection, 1833-1910 (bulk) 1833-2010 (inclusive)

Held at: Delaware County Institute of Science [Contact Us]

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M. Carey Lea opalotypes and manuscripts, circa 1840s-1890s

Held at: The Historical and Interpretive Collections of The Franklin Institute [Contact Us]

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Edwin C. Jellett papers, 1874-1931 (inclusive)

Held at: Germantown Historical Society [Contact Us]

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Jeannette Meehan Anderson collection on Thomas Meehan, 1985-1994 (bulk) 1890-1994 (inclusive)

Held at: Germantown Historical Society [Contact Us]