Historians--Research Material 19 Historians--19th century 12 History and Historians--19th century 11 History and Historians--20th century 8 Historians--Early 20th Century 5 Historians--20th century 4 Pennsylvania--History--17th and 18th centuries 4 more ... Historical Society of Pennsylvania 3 Historical Society of Pennsylvania--Presidents 3 Philadelphia--History 3 Historians--18th century 2 Historians--Pennsylvania 2 Historical Society of Pennsylvania--Correspondence 2 History of Philadelphia 2 Africa--Description and Travel--19th century 1 African American historians 1 Architectural history--Philadelphia 1 Art Historians--United States--20th century 1 Art, American--18th century 1 Biography--20th century 1 Brant, Joseph, 1743-1807 1 California--History--19th century 1 Canals--Chesapeake and Delaware 1 Censorship--Motion Pictures--Early 20th Century 1 Chester County (Pa.)--History--18th century 1 Chester County (Pa.)--History--19th century 1 Churches--Pennsylvania--Philadelphia 1 Churches--Presbyterian--History 1 Churches--Views 1 Clergymen--19th century 1 Clubs and Associations--Philadelphia--20th century 1 Commemorative Celebrations--Philadelphia 1 Commerce--Philadelphia--19th century 1 Court records--Pennsylvania--17th century 1 Court records--Pennsylvania--18th century 1 Darby County (Pa)--History 1 Delaware County (Pa.)--History--18th century 1 Delaware--Geography 1 Delaware--History--18th century 1 Education--Pennsylvania--19th century 1 less ...