History 134 Influence 109 History and criticism 60 Agronomy 58 Philosophy 41 Dissertations, Academic (Ph.D) 37 Politics and government 37 Criticism and interpretation 33 Mass media 33 Influence (Literary, artistic, etc.) 32 Soil Science and Agricultural Chemistry 30 English literature 28 Social aspects 27 Civilization 26 Intellectual life 26 Agriculture 24 Education 21 Psychology 19 MVSc 18 Political and social views 18 Social conditions 18 In literature 17 Political science 17 Communication 16 Law 16 Research 16 Leadership 15 Plant Physiology 15 Political aspects 15 Women 15