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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]
Held at: Delaware County Institute of Science [Contact Us]
Held at: Germantown Historical Society [Contact Us]
Held at: Chester County Historical Society [Contact Us]
Held at: Morris Arboretum Archives [Contact Us]
Held at: Delaware County Institute of Science [Contact Us]
Held at: Germantown Historical Society [Contact Us]
Held at: Morris Arboretum Archives [Contact Us]
Held at: Morris Arboretum Archives [Contact Us]
Held at: Friends Historical Library of Swarthmore College [Contact Us]
Held at: Haverford College Quaker & Special Collections [Contact Us]