Philadelphia (Pa.)--Social conditions--20th century 2 Advocacy organizations--Philadelphia--20th century 1 Affirmative action programs--Government policy--United States--History--20th century 1 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 more ... Charities--Pennsylvania--Philadelphia 1 City planning and development--Pennsylvania--Philadelphia--20th century 1 City planning--Pennsylvania--Philadelphia--20th century 1 College trustees--United States 1 Consumer activism--20th century 1 Department stores--Pennsylvania--Philadelphia 1 Depressions--1929--Pennsylvania--Philadelphia 1 Engineering firms--United States 1 Engineering proceedings 1 Engineering--Education 1 Engineering--Pennsylvania 1 Engineering--Pennsylvania--Philadelphia 1 Engineering--Problems, exercises, etc 1 Engineering--Social aspects--United States 1 Engineering--Societies, etc 1 Hotels--Pennsylvania--Philadelphia 1 Insurance companies--United States 1 Jews, American 1 Lawyers--Pennsylvania--Philadelphia--20th century 1 Mayors--Pennsylvania--Philadelphia 1 Mortgage banks--United States 1 Motion picture theaters--Pennsylvania--Philadelphia--1920-1940 1 Museums--Pennsylvania--Philadelphia--20th century 1 Pennsylvania--Politics and government 1 Pennsylvania--Politics and government--20th century 1 Philadelphia (Pa.)--City government--20th century 1 Philadelphia (Pa.)--City planning 1 Philadelphia (Pa.)--History--20th century 1 Philadelphia (Pa.)--Officials and employees 1 Philadelphia (Pa.)--Politics and government--20th century 1 Philadelphia (Pa.)--Social problems 1 Political conventions--Pennsylvania--Philadelphia 1 Politics and government--Pennsylvania--Philadelphia--20th century 1 less ...