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History 383 Social aspects 286 Study and teaching 142 Philosophy 140 Research 136 Psychological aspects 107 Data processing 105 Political aspects 105 Social conditions 104 Education 100 Management 96 Politics and government 94 Methodology 93 History and criticism 85 Economic aspects 81 Law and legislation 77 Technological innovations 71 Moral and ethical aspects 68 Psychology 64 Environmental aspects 62 Foreign relations 57 Government policy 52 Psychoanalysis 51 Sustainable development 50 Training of 48 Mathematical models 45 English language 44 Mathematics 44 Prevention 44 Economic development 43