History 263 History and criticism 102 Politics and government 64 Social conditions 41 English literature 34 Chemistry 30 Criticism and interpretation 30 Social aspects 23 Foreign relations 22 Mathematics 22 Intellectual life 19 Church history 16 Economic conditions 16 Historiography 15 Physics 14 Colonies 13 English fiction 13 Women 13 Biotechnology 12 English poetry 12 Microbiology 12 Quantum theory 12 World War, 1939-1945 12 In literature 11 Influence 11 Mathematical models 11 Nationalism 11 Political aspects 11 Women authors 11 World War, 1914-1918 11