History 174 America 170 United States 122 Latin America 60 Indians of North America 53 American Linguistics 52 Literature 46 Mathematics 42 Foreign relations 40 History and criticism 38 Philosophy 30 Women 28 American literature 25 Social Sciences 25 Social conditions 24 International relations 23 Politics and government 22 Economics 21 Government 21 Economic development 20 GENETICS 20 GENETICS : A Periodical Record Of Investigations Bearing On Heredity And Variation 19 Political aspects 19 Civilization 18 Geography 18 Journal, American Linguistics 18 Mass media 18 Social aspects 18 World politics 18 BOTANY 17