History 129 Influence 109 History and criticism 61 Agronomy 58 Philosophy 41 Politics and government 37 Criticism and interpretation 34 Dissertations, Academic (Ph.D) 33 Influence (Literary, artistic, etc.) 32 Mass media 32 Soil Science and Agricultural Chemistry 30 English literature 28 Civilization 26 Intellectual life 26 Social aspects 23 Agriculture 22 Education 20 In literature 17 Political and social views 17 Political science 17 Psychology 17 Social conditions 17 Communication 16 MVSc 16 Law 15 Plant Physiology 15 Political aspects 15 Research 15 Women 15 Foreign relations 14