20th Century HISTORY 457 History 362 Histoire 296 Modern 185 General 154 SOCIAL SCIENCE 126 POLITICAL SCIENCE 118 Politics and government 95 Politique et gouvernement 79 Social conditions 69 Social aspects 61 Conditions sociales 55 Aspect social 52 BIOGRAPHY & AUTOBIOGRAPHY 44 Political aspects 44 BUSINESS & ECONOMICS 43 Aspect politique 38 African Americans 36 Discrimination & Race Relations 36 Reference 35 State & Local 35 Ethnic Studies 34 Government 34 Diplomatic relations 31 Foreign relations 31 LITERARY CRITICISM 30 Military 28 Race relations 27 Social History 26