History 244 Politics and government 93 History and criticism 77 Economic conditions 40 English literature 38 Biography 33 Criticism and interpretation 31 English poetry 31 English language 30 Sources 29 Concordances 24 Colonies 22 Bibliography 21 Dictionaries 18 Foreign relations 18 English drama 17 Philosophy 17 Social conditions 17 Commerce 16 Correspondence 16 Civilization 15 Money 15 Constitutional history 14 World War, 1914-1918 14 Congresses 13 Political science 13 Religion 13 Social life and customs 13 Constitutional law 12 Economic policy 12