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Constantine Hering and Calvin B. Knerr family papers, 1820-1940 (bulk) 1820-2003 (inclusive)
Held at: Drexel University: College of Medicine Legacy Center [Contact Us]
Held at: Drexel University: College of Medicine Legacy Center [Contact Us]
Held at: Independence Seaport Museum, J. Welles Henderson Archives and Library [Contact Us]
Held at: Drexel University: College of Medicine Legacy Center [Contact Us]
Held at: Wagner Free Institute of Science [Contact Us]
Held at: Chester County Historical Society [Contact Us]
Held at: Academy of Natural Sciences, Philadelphia [Contact Us]
Held at: Philadelphia Archdiocesan Historical Research Center [Contact Us]
Held at: Historical Society of Pennsylvania [Contact Us]
Held at: German Society of Pennsylvania: Joseph P. Horner Memorial Library [Contact Us]
Held at: Free Library of Philadelphia: Children's Literature Research Collection [Contact Us]