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Delaware County Institute of Science manuscript collection, 1686-2014 (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: Plymouth Meeting Historical Society [Contact Us]
Held at: Tri-County Heritage Library [Contact Us]
Held at: Historical Society of Fort Washington [Contact Us]
Held at: Newtown Historic Association [Contact Us]
Held at: Newtown Square Historical Society [Contact Us]
Held at: Delaware County Historical Society [Contact Us]
Held at: Goschenhoppen Historians, Inc. [Contact Us]
Held at: Germantown Historical Society [Contact Us]