History 74 Politics and government 35 Operas 25 Scores 19 Czech literature 18 Social conditions 16 Songs (High voice) with piano 15 more ... Vocal scores with piano 15 Music 13 Philosophy 12 History and criticism 11 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 Jews 7 Language and languages 7 Discourse analysis 6 Foreign relations 6 Linguistics 6 Social life and customs 6 Universities and colleges 6 World War, 1914-1918 6 Criticism and interpretation 5 Czechs 5 less ...