History 313 African Americans 100 Education 92 Social conditions 70 Buildings 54 Politics and government 53 Penn dissertations 34 more ... Study and teaching 34 Social life and customs 33 Women 27 Working class 26 Economic conditions 25 Architecture 24 Housing 24 Students 24 Race relations 23 Theater 23 Urban renewal 23 Employment 21 Labor movement 19 Academic achievement 18 City planning 18 Public schools 18 Research 17 Labor 16 Jews 15 Music 15 Society of Friends 15 Buildings, structures, etc 14 Furniture 14 less ...