History 74 Politics and government 35 Operas 25 Czech literature 19 Scores 19 Social conditions 16 Songs (High voice) with piano 15 more ... Vocal scores with piano 15 Music 14 History and criticism 13 Philosophy 13 Holocaust, Jewish (1939-1945) 11 Social aspects 11 World War, 1939-1945 10 Scores and parts 9 Songs (Medium voice) with piano 9 Czech language 8 Civilization 7 Czech poetry 7 Ethnic relations 7 Foreign relations 7 Jews 7 Language and languages 7 Social life and customs 7 Czechs 6 Diplomatic relations 6 Discourse analysis 6 Linguistics 6 Universities and colleges 6 World War, 1914-1918 6 less ...