Glass manufacture 14 Manufactures 6 History 5 Industries 3 Business and manufacturing--Pennsylvania--Philadelphia--20th century 2 Description and travel 2 Glassware 2 more ... Glassware, Colonial 2 Industrial arts 2 Iron industry and trade 2 Iron manufacturing--Pennsylvania--18th century 2 Merchants--Pennsylvania--Philadelphia--18th century 2 Patents 2 Potters 2 Pottery, Colonial 2 Steel industry and trade 2 Travel 2 %SP4 1 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 mergers and acquisitions--20th century 1 Business--History--Pennsylvania--Philadelphia--20th century 1 Chamber of Commerce--Philadelphia 1 Child labor 1 City planning and development--Pennsylvania--Philadelphia--20th century 1 City planning--Pennsylvania--Philadelphia--20th century 1 Commerce--18th century 1 Commerce--West Indies--18th century 1 Consumer activism--20th century 1 Cotton manufacture 1 Deindustrialization 1 Descriptions et voyages 1 Directories 1 Dry goods--18th century 1 Economic conditions 1 Excavations (Archaeology) 1 Fabrication 1 French and Indian War 1 General stores--Pennsylvania--19th century 1 less ...