History 370 World War, 1939-1945 299 World War, 1914-1918 271 History and criticism 173 American 148 Missions 137 Military operations, Naval 136 more ... Naval operations, American 133 Economic conditions 112 Education 106 Art 96 African Americans 92 Philosophy 91 Politics and government 90 Study and teaching 81 Economics 75 Mathematics 74 Theology 66 Civilization 58 Social sciences 56 English literature 54 Psychology 54 American literature 53 Antiquities 52 Theater 52 Classical philology 49 International relations 49 International law 47 Research 47 Literature 46 less ...