History 1,733 Politics and government 542 History and criticism 478 Description and travel 293 Travel 281 English language 222 Philosophy 191 Foreign relations 170 Social conditions 152 Diplomatic relations 151 World War, 1914-1918 148 Christianity 144 Civilization 142 Study and teaching 140 Social life and customs 138 Social aspects 133 Slavery 131 Grammar, Comparative and general 128 World War, 1939-1945 125 Enslavement 124 Education 119 Law 115 Manners and customs 112 Religious aspects 110 Economic conditions 106 Criticism and interpretation 104 American poetry 102 English literature 98 Religion 98 Criticism, interpretation, etc 96