History 150 Influence 109 History and criticism 72 Philosophy 64 Agronomy 58 Politics and government 41 Criticism and interpretation 37 Dissertations, Academic (Ph.D) 37 Mass media 35 Influence (Literary, artistic, etc.) 32 Soil Science and Agricultural Chemistry 30 Social aspects 29 English literature 28 Civilization 27 Intellectual life 26 Education 25 Agriculture 24 Women 23 Political science 22 Social conditions 22 Psychology 21 Political and social views 19 MVSc 18 In literature 17 Literature 17 Research 17 Communication 16 Law 16 Leadership 16 Ethics 15