History 353 Frontier and pioneer life 131 In literature 74 History and criticism 72 Description and travel 65 Indians of North America 63 Travel 43 更多 ... Discovery and exploration 40 Social conditions 39 American literature 36 Pioneers 35 Social life and customs 32 Territorial expansion 30 Women 30 Authors, American 26 Western stories 26 Wars 25 Race relations 24 Discoveries in geography 23 Women pioneers 22 Politics and government 21 Economic conditions 20 Literature 20 Womyn 19 Criticism and interpretation 18 Overland journeys to the Pacific 18 Women authors 18 African Americans 17 Art, American 17 Explorers 17 少 ...