Pennsylvania--Description and travel--19th century 15 Pennsylvania--Description and Travel--18th century 9 New York--Description and Travel--19th century 4 Ohio--Description and Travel--19th century 2 Pennsylvania--Description and Travel--20th century 2 Social Life and Customs--Pennsylvania--19th century 2 Social life and customs--Pennsylvania--18th century 2 more ... Social life and customs--Pennsylvania--Philadelphia (Pa.)--19th century 2 Agriculture--Luzerne County (Pa.)--19th century 1 Botany--19th century 1 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 Cooking--18th Century 1 Description and travel 1 Descriptions et voyages 1 Ephrata Cloisters (PA) 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 Health Products 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--18th century 1 Indian--White Relations--19th century 1 Indians of North America--Politics and government 1 Indians--18th century 1 less ...