City planning--Pennsylvania--Philadelphia--20th century 5 Advertising--Pennsylvania--Philadelphia--20th Century 1 Advocacy organizations--Philadelphia--20th century 1 Affirmative action programs--Government policy--United States--History--20th century 1 Airports--Philadelphia 1 Architecture--20th Century 1 Building Trade--20th Century 1 more ... Built environment--Pennsylvania--Philadelphia--20th century 1 Business and manufacturing--Pennsylvania--Philadelphia--20th century 1 Business mergers and acquisitions--20th century 1 Business--History--Pennsylvania--Philadelphia--20th century 1 City planning and development--Pennsylvania--Philadelphia--20th century 1 Consumer activism--20th century 1 Hog Island Philadelphia Airport Terminal 1 Housing--Pennsylvania--Philadelphia --20th century 1 Lawyers--Pennsylvania--Philadelphia--20th century 1 Museums--Pennsylvania--Philadelphia--20th century 1 Pennsylvania--Politics and government--20th century 1 Philadelphia (Pa.)--City government--20th century 1 Philadelphia (Pa.)--Politics and government--20th century 1 Politics and government--Pennsylvania--Philadelphia--20th century 1 Slums--Pennsylvania--Philadelphia 1 United States--Politics and government--20th century 1 Veterans--Education--Government policy--United States 1 Veterans--Education--United States 1 Veterans--Education--United States--Costs 1 Veterans--Education--United States--Evaluation 1 Veterans--Education--United States--History--20th century 1 Veterans--Employment--United States 1 Veterans--Employment--United States--Evaluation 1 Veterans--Employment--United States--History--20th century 1 Veterans--Employment--United States--Law and legislation 1 Veterans--United States 1 Veterans--United States--Social conditions--20th century 1 World Fairs and Exhibitions 1 less ...