Boundaries 9 History 7 Whiskey Rebellion, Pa., 1794 4 Mason-Dixon Line 2 Pennsylvania--History--Colonial period, ca. 1600-1775 2 Surveying 2 Boundary 1 more ... Boundary disputes 1 Canals--Chesapeake and Delaware 1 Church history 1 Commerce--Philadelphia--19th century 1 Design and construction 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 Historical markers 1 History of Philadelphia 1 History--Publishing 1 Hobbyists--Pennsylvania 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 Library 1 Maps--Pennsylvania 1 Maps--Pennsylvania--Bucks County 1 Maps--Pennsylvania--Philadelphia County 1 Native Americans 1 Pennsylvania 1 Pennsylvania Views 1 Pennsylvania Views--19th century 1 Pennsylvania--Boundaries 1 less ...