History 186 America 170 United States 122 Latin America 60 Indians of North America 53 American Linguistics 52 Literature 45 Mathematics 44 History and criticism 43 Foreign relations 40 Philosophy 33 Women 29 American literature 25 Politics and government 25 Social Sciences 24 Social conditions 24 International relations 23 Research 22 Economics 21 Government 21 Social aspects 21 Democracy 20 Economic development 20 GENETICS 20 Political aspects 20 GENETICS : A Periodical Record Of Investigations Bearing On Heredity And Variation 19 Geography 19 Civilization 18 Globalization 18 Journal, American Linguistics 18