Manufacturing--Philadelphia--20th century 5 Iron Manufacturing--19th century 4 Manufacturing--Philadelphia--19th century 3 Merchants--Pennsylvania--Philadelphia--18th century 3 Social life and customs--Pennsylvania--Philadelphia (Pa.)--19th century 3 Business and manufacturing--Pennsylvania--Philadelphia--20th century 2 Iron Manufacturing--Mid-19th Century 2 more ... Iron industry and trade--Pennsylvania 2 Iron manufacturing--Pennsylvania--18th century 2 Lead manufacturing--19th century 2 Manufacturing--Philadelphia--18th century 2 Merchants--Pennsylvania--Philadelphia--19th century 2 Paper Manufacturing--Philadelphia--18th century 2 Railroad Equipment--19th Century 2 Railroad Equipment--20th Century 2 World War, 1914-1918--Mobilization and Wartime Manufacturing 2 Accounts--18th century 1 Accounts--19th century 1 Adolescence--19th Century 1 Advertising--20th century 1 Advocacy organizations--Philadelphia--20th century 1 Affirmative action programs--Government policy--United States--History--20th century 1 Autographs--19th century 1 Books and Bookselling--19th Century 1 Brokenstraw Township (Warren County, Pa) 1 Building Trades--19th century 1 Built environment--Pennsylvania--Philadelphia--20th century 1 Business Transactions--Philadelphia--19th century 1 Business mergers and acquisitions--20th century 1 Business--History--Pennsylvania--Philadelphia--20th century 1 Carpet Manufacturing--Philadelphia--19th century 1 Carpet Mills--Kensington, Pa.--19th century 1 Cast-Iron pipe 1 Chamber of Commerce--Philadelphia 1 Chemical manufacturing--19th century 1 Chicago fire, 1871 1 Childhood 1 Chocolate manufacturing--Philadelphia--19th century 1 Cigars--Manufacturing--19th century 1 City planning and development--Pennsylvania--Philadelphia--20th century 1 less ...