History 14 Gold discoveries 8 Gold mines and mining 7 Description and travel 6 Pioneers 6 Frontier and pioneer life 5 Overland journeys to the Pacific 5 more ... Economic conditions 4 Politics and government 4 Photograph collections 3 Social conditions 3 African American women journalists 2 African Americans 2 American literature 2 Environmental conditions 2 Gold miners 2 History and criticism 2 Identity (Psychology) in literature 2 In literature 2 Land use 2 Landscape photography 2 Liberalism in literature 2 Politics and literature 2 Race relations 2 Railroads 2 Water resources development 2 Architecture 1 Architecture, Domestic 1 Artists 1 Authors, American 1 less ...