History 348 Frontier and pioneer life 127 In literature 74 History and criticism 72 Description and travel 65 Indians of North America 63 Travel 43 hơn ... Discovery and exploration 40 Social conditions 39 American literature 36 Pioneers 34 Social life and customs 32 Territorial expansion 29 Women 29 Authors, American 26 Western stories 26 Wars 25 Discoveries in geography 23 Race relations 23 Politics and government 21 Women pioneers 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 ít hơn ...