History 164 History and criticism 58 Politics and government 38 Social aspects 32 English literature 29 Political aspects 20 Social conditions 20 Criticism and interpretation 18 Mathematical models 18 International relations 17 Philosophy 16 Climatic changes 15 Moral and ethical aspects 15 Research 15 Methodology 14 Psychological aspects 14 Economic aspects 12 Environmental aspects 12 Political culture 12 Data processing 11 Economic policy 11 Management 11 Civilization 10 Colonies 10 Economic conditions 10 Foreign relations 10 Government policy 10 Literature and society 10 English fiction 9 Historiography 9