Family life--Pennsylvania--19th century 2 Family life--Pennsylvania--20th century 2 Genealogy 2 Spouses--Correspondence--19th century 2 Ballet companies--Pennsylvania--Philadelphia 1 Canals and railroads--19th century 1 Canals--Chesapeake and Delaware 1 more ... Centennial Exhibition (1876 : Philadelphia, Pa.) 1 Clubs--Pennsylvania--Philadelphia 1 Commerce--Philadelphia--19th century 1 Delaware & Schuylkill Canal 1 Engineering--Pennsylvania--Philadelphia 1 Estate administration--19th century 1 Family life--Pennsylvania--18th century 1 Family life--Pennsylvania--Philadelphia 1 Family life--Pennsylvania--Philadelphia--19th century 1 Family life--Personal correspondence--19th century 1 Family life--Personal correspondence--20th century 1 Family life--Upper Class--19th century 1 Family life--Upper Class--Pennsylvania--Philadelphia--20th century 1 Germantown (Philadelphia, Pa.) 1 Germantown (Philadelphia, Pa.)--History 1 Glen Foerd (Philadelphia, Pa.) 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--18th century 1 Indians--19th century 1 Korean War, 1950-1953 1 Land Settlement--Pennsylvania--18th century 1 Land settlement--Pennsylvania 1 Lectures and lecturing--Pennsylvania--Philadelphia 1 Maps--Pennsylvania 1 Maps--Pennsylvania--Bucks County 1 less ...