History 478 Business enterprises 159 Directories 128 Commerce 95 Economic conditions 85 African Americans 74 Description and travel 70 more ... Histoire 69 Central business districts 62 Politics and government 55 Business 50 Social conditions 49 Streets 47 Railroads 42 Minority business enterprises 39 Social life and customs 38 Businessmen 30 Industries 29 Biography 28 Genealogy 28 Real estate business 27 Social aspects 27 Periodicals 26 Race relations 22 Societies, etc 22 Jews 21 Minorities 21 African American business enterprises 20 Education 20 Real property 19 Restaurants 19 Slavery 19 Emigration and immigration 18 Management 18 Women 18 Economic aspects 17 Employment 17 Estate administration--19th century 17 Merchants--Pennsylvania--Philadelphia--18th century 17 World War, 1939-1945 17 less ...