Pennsylvania--History--17th and 18th centuries 6 Historians--19th century 3 Historical Society of Pennsylvania 2 Pennsylvania Views--19th century 2 Canals--Chesapeake and Delaware 1 Commerce--Philadelphia--19th century 1 Delaware--Geography 1 more ... Delaware--History--18th century 1 Ephrata (Pa.)--History--18th century 1 Estate administration--19th century 1 Europe--Description and Travel--19th century 1 German Immigrants--18th century 1 Germantown (Philadelphia, Pa.) 1 Germantown (Philadelphia, Pa.)--History 1 Graeme Park, Pa 1 Historians--18th century 1 Historians--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--18th century 1 Indians--19th century 1 Land Settlement--Pennsylvania--18th century 1 Land settlement--Pennsylvania 1 Maps--Pennsylvania 1 Maps--Pennsylvania--Bucks County 1 Maps--Pennsylvania--Philadelphia County 1 Mason-Dixon Line 1 Pennsylvania Views 1 Pennsylvania Views--20th century 1 Pennsylvania--Description and travel--19th century 1 Pennsylvania--History 1 Pennsylvania--History--1775-1865 1 Pennsylvania--History--Colonial period, ca. 1600-1775 1 Pennsylvania--Travel and Description--19th century 1 Philadelphia Views--18th century 1 Philadelphia Views--19th century 1 Philadelphia--Description and Travel--19th century 1 less ...