History 22 Frontier and pioneer life 18 Explorers 9 Pioneers 9 Description and travel 7 Discovery and exploration 6 Indians of North America 6 more ... Authors, American 5 In literature 4 Wars 4 Histoire 3 Intellectual life 3 Outlaws 3 Overland journeys to the Pacific 3 Territorial expansion 3 Women 3 African American soldiers 2 African American troops 2 African Americans 2 Conservationists 2 Descriptions et voyages 2 Découverte et exploration 2 Explorateurs 2 Governors 2 History and criticism 2 Homes and haunts 2 Illustrators 2 Novelists, American 2 Race relations 2 Social life and customs 2 less ...