History 832 Social conditions 139 African Americans 120 Politics and government 107 Race relations 85 Social life and customs 80 Social aspects 79 Economic conditions 68 Indians of North America 58 Description and travel 47 Manners and customs 42 Society of Friends 39 Art 34 Education 33 Coal miners 32 Architecture 31 Urban renewal 30 Buildings, structures, etc 28 Gettysburg, Battle of, Gettysburg, Pa., 1863 27 City planning 26 Economic history 26 Ethnic relations 26 Labor unions 26 Church history 25 Quakers 25 Women 25 Working class 25 Labor movement 24 Religious aspects 23 Pennsylvania Dutch 22 Criticism and interpretation 21 Homes and haunts 21 Industries 21 Law 21 Antiquities 20 Coal mines and mining 20 Historic buildings 20 Immigrants 20 Civil rights 19 Geology 19 Private collections 19 Steel industry and trade 19 Economic aspects 18 Iron and steel workers 18 Law and legislation 18 Religion 18 African American women 17 Art, American 17 Law reviews 17 Political aspects 17 Prisoners 17 Intellectual life 16 Antislavery movements 15 Art collections 15 Art museums 15 Emigration and immigration 15 Frontier and pioneer life 15 Government policy 15 Painting 15 Theater 15 Cultural assimilation 14 History and criticism 14 Iroquois Indians 14 Jews 14 Civilization 13 Ethnic identity 13 Families 13 Finance 13 Free African Americans 13 Histoire 13 Historic sites 13 Medical care 13 Yellow fever 13 history 13 Architecture, Domestic 12 Community development 12 Elections 12 Employment 12 Moravians 12 Prisons 12 Slavery 12 Soldiers 12 Urbanization 12 Exhibitions 11 German Americans 11 Housing 11 Industrialization 11 Medicine 11 Printing 11 Railroads 11 Regimental histories 11 Strikes and lockouts 11 Travel 11 Accidents 10 Cities and towns 10 City and town life 10 Droit 10 Environmental conditions 10 Fugitive slaves 10 Languages 10