History 358 Politics and government 68 History and criticism 64 Social conditions 63 Social aspects 60 Social life and customs 50 Indians of North America 47 Environmental conditions 40 Ethnic relations 39 Criticism and interpretation 38 Political aspects 32 Environmental aspects 28 Description and travel 24 Intellectual life 23 Economic conditions 19 Foreign relations 18 Japanese Americans 18 Women 18 Nature conservation 17 World War, 1939-1945 17 American literature 16 Ethnology 16 Jews 16 Civilization 15 Relations 15 Ethnic identity 14 Holocaust, Jewish (1939-1945) 14 Religious aspects 14 Government relations 13 Historiography 13