History 90 Fiction 49 Politics and government 45 Biography 32 History and criticism 18 Foreign relations 14 Civilization 13 Social conditions 12 Social life and customs 12 Description and travel 10 Economic policy 9 Economic conditions 7 World War, 1914-1918 7 World War, 1939-1945 7 Education 6 Music 6 Science 6 Sociology 6 Theater 6 Authors, American 5 Composers 5 Drama 5 Nationalism 5 Political science 5 Psychology 5 Race relations 5 Working class 5 African Americans 4 English literature 4 Industrial policy 4