Frontier and pioneer life History 627 Indians of North America 139 Pioneers 117 Social life and customs 106 Women pioneers 57 Description and travel 51 Wars 51 Cowboys 50 Race relations 43 Social conditions 40 Ethnic relations 37 Ranch life 37 Outlaws 35 Territorial expansion 33 Women 33 Social aspects 30 Families 28 Gold discoveries 28 Discovery and exploration 27 Overland journeys to the Pacific 27 Military life 26 Cattle trade 24 Politics and government 23 Historiography 20 African Americans 19 Violence 19 Crime 18 Government relations 17 Land settlement 17