History 5 Pennsylvania--History--Colonial period, ca. 1600-1775 5 Pennsylvania--History 3 Description and travel 2 Mason-Dixon Line 2 Pennsylvania--History--1775-1865 2 United States--History--Revolution, 1775-1783 2 more ... Boundary disputes 1 Canals--Chesapeake and Delaware 1 Chronology, Historical 1 Commerce--Philadelphia--19th century 1 Decedents’ estates--Pennsylvania 1 Estate administration--19th century 1 Germantown (Philadelphia, Pa.) 1 Germantown (Philadelphia, Pa.)--History 1 Graeme Park, Pa 1 Historians--19th century 1 Historians--Pennsylvania 1 Historical Society of Pennsylvania 1 Historical Society of Pennsylvania--Founding members 1 Historical Society of Pennsylvania--Researchers 1 History of Philadelphia 1 History--Publishing 1 Hobbyists--Pennsylvania 1 Indians of North America 1 Indians--18th century 1 Indians--19th century 1 Indians--First contact with Europeans 1 Land Settlement--Pennsylvania--18th century 1 Land settlement--Pennsylvania 1 Legal issues 1 Maps--Pennsylvania 1 Maps--Pennsylvania--Bucks County 1 Maps--Pennsylvania--Philadelphia County 1 Medical education 1 Middle Atlantic States--Commerce 1 Native Americans 1 Pennsylvania Views 1 Pennsylvania Views--19th century 1 Pennsylvania--Boundaries 1 less ...