History 409 Business enterprises 147 Directories 127 Commerce 90 Economic conditions 82 Description and travel 68 African Americans 60 more ... Central business districts 59 Histoire 50 Business 48 Streets 44 Politics and government 43 Railroads 37 Social conditions 37 Minority business enterprises 35 Social life and customs 30 Businessmen 28 Biography 27 Genealogy 26 Industries 26 Real estate business 26 Periodicals 25 Societies, etc 21 Minorities 20 African American business enterprises 19 Social aspects 19 Education 18 Real property 18 Employment 17 Estate administration--19th century 17 Jews 17 Management 17 Merchants--Pennsylvania--Philadelphia--18th century 17 Women 17 International trade--18th century 16 Slavery 16 World War, 1939-1945 16 Emigration and immigration 15 Merchants 15 Race relations 15 less ...