History 152 Frontier and pioneer life 31 Politics and government 30 Social life and customs 25 Mexican Americans 24 Governors 17 Authors, American 12 more ... History and criticism 12 Peace officers 12 Philanthropists 12 Pioneers 12 Social conditions 12 Ranchers 10 African Americans 9 Childhood and youth 9 College teachers 9 In literature 9 Outlaws 9 Race relations 9 Soldiers 9 Women 9 Civil rights 8 Description and travel 8 Homes and haunts 8 Politicians 8 Violence 8 Businessmen 7 Intellectual life 7 Officials and employees 7 World War, 1939-1945 7 less ...