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Herbert T. Pratt ephemera collection, 1830-1961 (inclusive)
Held at: Science History Institute Archives [Contact Us]
Held at: Science History Institute Archives [Contact Us]
Held at: Independence Seaport Museum, J. Welles Henderson Archives and Library [Contact Us]
Held at: Philadelphia Archdiocesan Historical Research Center [Contact Us]
Held at: Friends Historical Library of Swarthmore College [Contact Us]
Held at: Old York Road Historical Society [Contact Us]
Held at: Eastern State Penitentiary [Contact Us]
Held at: Quaker Meeting Records at Haverford College Quaker & Special Collections and Friends Historical Library of Swarthmore College [Contact Us]
Held at: Historical Society of the Eastern Pennsylvania Conference of the United Methodist Church [Contact Us]
Held at: Haverford College Quaker & Special Collections [Contact Us]
Held at: Haverford College Quaker & Special Collections [Contact Us]