Pennsylvania--History--Colonial period, ca. 1600-1775 5 Mayors--Pennsylvania--Philadelphia 3 Pennsylvania--History 3 Philadelphia (Pa.)--City planning 3 Philadelphia (Pa.)--History--20th century 3 Philadelphia (Pa.)--Officials and employees 3 Philadelphia (Pa.)--Social conditions--20th century 3 more ... Artists 2 Centennial Exhibition (1876 : Philadelphia, Pa.) 2 Charities 2 Education 2 Historians--19th century 2 Historians--Pennsylvania 2 History of Philadelphia 2 Insurance companies--United States 2 Mason-Dixon Line 2 Municipal officials and employees--Pennsylvania--Philadelphia 2 Pennsylvania--History--1775-1865 2 Philadelphia (Pa.)--City government--20th century 2 Philadelphia (Pa.)--Civic improvement 2 Philadelphia (Pa.)--Politics and government--20th century 2 Philadelphia (Pa.)--Social problems 2 Philadelphia Views--19th century 2 United States--History--Revolution, 1775-1783 2 Urban renewal--Pennsylvania--Philadelphia 2 Women's history--Pennsylvania--Philadelphia 2 World War II 2 Actors and actresses 1 African American families 1 African American universities and colleges 1 African Americans 1 African Americans--Education 1 Architecture--Pennsylvania--Philadelphia--History 1 Art Exhibitions 1 Art and artists--Pennsylvania--Philadelphia 1 Artists--Pennsylvania--Philadelphia--20th century 1 Artists--United States 1 Balls (Parties) 1 Boundary disputes 1 Business history 1 less ...