History 205 Law and legislation 139 Economic conditions 123 Education 115 Politics and government 112 Foreign relations 110 Relations 65 更多 ... Study and teaching 65 Industries 61 Economic forecasting 59 Emigration and immigration 59 Statistics 57 Taxation 57 Finance 53 Social conditions 51 United States 50 History and criticism 46 Commerce 43 Historia 42 Estados Unidos 41 UNITED STATES 41 Economic history 39 Droit 38 Zeitschrift 38 Education, Higher 37 Research 37 Universities and colleges 36 Administration 35 Law 35 Armed Forces 34 少 ...