Historians--19th century 12 History and Historians--19th century 11 Pennsylvania--History--17th and 18th centuries 3 Historians--Pennsylvania 2 Historical Society of Pennsylvania 2 History of Philadelphia 2 Philadelphia--History 2 more ... California--History--19th century 1 Canals--Chesapeake and Delaware 1 Commerce--Philadelphia--19th century 1 Education--Pennsylvania--19th century 1 Estate administration--19th century 1 Genealogy 1 Germantown (Philadelphia, Pa.) 1 Germantown (Philadelphia, Pa.)--History 1 Graeme Park, Pa 1 Historians--Research Material 1 Historical Society of Pennsylvania--Correspondence 1 Historical Society of Pennsylvania--Founding members 1 Historical Society of Pennsylvania--Presidents 1 Historical Society of Pennsylvania--Researchers 1 History--Publishing 1 Hobbyists--Pennsylvania 1 Indians--18th century 1 Indians--19th century 1 Kansas--History--19th century 1 Land Settlement--Delaware Valley (Pa.)--18th century 1 Land Settlement--Pennsylvania--18th century 1 Land settlement--Pennsylvania 1 Legal Documents--18th Century 1 Manayunk (Philadelphia, Pa)--History 1 Maps--Pennsylvania 1 Maps--Pennsylvania--Bucks County 1 Maps--Pennsylvania--Philadelphia County 1 Mason-Dixon Line 1 Mexico--History--19th century 1 Moravians--History 1 Mount Holly, NJ--History 1 Oley, Berks County (Pa.)--History--18th century 1 Oley, Berks County (Pa.)--History--19th century 1 less ...