History 929 Politics and government 161 Social life and customs 137 Frontier and pioneer life 135 Mexican Americans 122 Social conditions 118 Description and travel 89 more ... Histoire 87 Indians of North America 86 African Americans 83 Race relations 83 Geology 61 Social aspects 57 Ranch life 52 Economic conditions 45 Ethnic relations 44 Folklore 42 Géologie 41 Art 40 History and criticism 38 Architecture 37 Soldiers 36 Governors 34 Publications about Graduates 33 Cowboys 32 Families 32 Law and legislation 32 Art collections 31 Campaigns 31 Petroleum 31 less ...