History 1,733 Politics and government 541 History and criticism 470 Description and travel 295 Travel 281 English language 221 Philosophy 192 Foreign relations 169 Social conditions 153 Diplomatic relations 151 World War, 1914-1918 147 Christianity 145 Civilization 142 Study and teaching 140 Social life and customs 137 Social aspects 131 Slavery 130 Grammar, Comparative and general 128 Enslavement 124 World War, 1939-1945 124 Education 122 Law 115 Manners and customs 112 Religious aspects 109 Economic conditions 108 American poetry 102 Criticism and interpretation 101 English literature 98 Religion 98 Criticism, interpretation, etc 97