Navy-yards and naval stations 3 Boat & ship industry 2 Naval yards & naval stations 2 Air bases 1 Air pilots 1 Aircraft 1 Aircraft industry 1 more ... Barges 1 Centennial Exhibition (1876 : Philadelphia, Pa.) 1 Centennial celebrations 1 Charities--Pennsylvania--Philadelphia 1 College trustees--United States 1 Defense industry 1 Department stores--Pennsylvania--Philadelphia 1 Depressions--1929--Pennsylvania--Philadelphia 1 Economic & industrial aspects 1 Employment 1 Hotels--Pennsylvania--Philadelphia 1 Insurance companies--United States 1 Jews, American 1 Labor housing 1 Land use 1 Military parades & ceremonies 1 Mobile homes 1 Mortgage banks--United States 1 Motion picture theaters--Pennsylvania--Philadelphia--1920-1940 1 Naval operations 1 Navy-yards and naval stations--Philadelphia (Pa.) 1 Newspapers--Pennsylvania--Philadelphia 1 Newspapers--Pennsylvania--Philadelphia--20th century 1 Pennsylvania--Politics and government 1 Philadelphia (Pa.)--City planning 1 Philadelphia (Pa.)--Newspapers 1 Philadelphia Naval Yard (Philadelphia, Pa.)--19th Century 1 Philadelphia Views--19th century 1 Philadelphia Views--20th century 1 Photographs--Street scenes 1 Political conventions--Pennsylvania--Philadelphia 1 Presidents election 1 Radio stations--United States 1 less ...