History 206 Congresses 83 Civilization 81 Foreign relations 77 Relations 64 Study and teaching 54 Economic conditions 52 more ... International relations 46 Foreign economic relations 41 World War, 1939-1945 37 Politics and government 34 Social conditions 31 Commerce 26 Research 26 Congrès 24 Technological innovations 23 History and criticism 22 Antiquities 21 International economic relations 20 Historiography 18 Japanese language 17 Academic libraries 16 Kongress 16 Social aspects 16 Technology 16 Automobile industry and trade 15 Description and travel 15 Economic history 15 Exhibitions 15 Peace 15 less ...