Pennsylvania--Description and travel--19th century New York--Description and Travel--19th century 4 Ohio--Description and Travel--19th century 2 Social Life and Customs--Pennsylvania--19th century 2 Social life and customs--Pennsylvania--Philadelphia (Pa.)--19th century 2 Agriculture--Luzerne County (Pa.)--19th century 1 Botany--19th century 1 more ... California--Description and travel--19th Century 1 Canals--Chesapeake and Delaware 1 Centennial Exhibition (1876 : Philadelphia, Pa.) 1 Chemistry--Study and teaching--19th century 1 Commerce--Philadelphia--19th century 1 Connecticut--Description and Travel--19th century 1 Estate administration--19th century 1 Farming--Pennsylvania--19th century 1 Frontier and pioneer life--American West--19th century 1 Germantown (Philadelphia, Pa.) 1 Germantown (Philadelphia, Pa.)--History 1 Girard College 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 Indian--White Relations--19th century 1 Indians--18th century 1 Indians--19th century 1 Land Settlement--Pennsylvania--18th century 1 Land Settlements--Luzerne County (Pa.)--19th century 1 Land settlement--Pennsylvania 1 Maps--Pennsylvania 1 Maps--Pennsylvania--Bucks County 1 Maps--Pennsylvania--Philadelphia County 1 Mason-Dixon Line 1 Montreal--Deswcription and Travel--19th century 1 Newspapers--Employees--19th century 1 less ...