History 872 Social conditions 141 African Americans 124 Politics and government 111 Race relations 89 Social life and customs 81 Social aspects 80 more ... Economic conditions 69 Indians of North America 61 Description and travel 47 Manners and customs 43 Society of Friends 41 Art 37 Education 34 Buildings, structures, etc 33 Architecture 32 Coal miners 32 Gettysburg, Battle of, Gettysburg, Pa., 1863 31 Urban renewal 30 Antiquities 29 City planning 28 Church history 27 Economic history 27 Labor unions 26 Religious aspects 26 Women 26 Ethnic relations 25 Pennsylvania Dutch 25 Quakers 25 Working class 25 less ...