History 5 Labor unions 5 African Americans 4 Clothing trade 3 International trade--18th century 3 International trade--19th century 3 Philadelphia (Pa.)--Officials and employees 3 more ... Philadelphia (Pa.)--Politics and government--20th century 3 Political aspects 3 Booksellers and bookselling 2 Centennial Exhibition (1876 : Philadelphia, Pa.) 2 Commerce 2 Economic aspects 2 Employment 2 Finance--Pennsylvania--Philadelphia--18th century 2 Labor unions and communism 2 Noirs américains 2 Pennsylvania--Politics and government 2 Philadelphia (Pa.)--City government--20th century 2 Philadelphia (Pa.)--City planning 2 Philadelphia (Pa.)--History--20th century 2 Philadelphia (Pa.)--Social conditions--20th century 2 Puerto Rican Week Festival (Philadelphia, Pa.) 2 Slavery 2 Societies, etc 2 Strikes and lockouts 2 Women--Suffrage 2 Abbreviations, English 1 Abolitionists 1 Academy of Natural Sciences--Philadelphia (Pa.) 1 Accounts--18th century 1 Accounts--19th century 1 Acronyms 1 Administrative and political divisions 1 Advertising cards--United States 1 Advertising--19th century 1 Advertising--20th century 1 Advertising--Fashion--United States--History--20th century 1 Advertising--United States--History--20th century 1 Aeronautics, Commercial--Law and legislation--United States 1 less ...