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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: Newtown Historic Association [Contact Us]
Held at: Plymouth Meeting Historical Society [Contact Us]
Held at: Concord Township Historical Society [Contact Us]
Held at: Horsham Preservation and Historical Association [Contact Us]
Held at: Marple Historical Society [Contact Us]
Held at: Radnor Historical Society [Contact Us]