Sources History 1,323 Politics and government 164 Foreign relations 99 Archives 88 Bibliography 82 Biography 79 Chronology 52 Catalogs 39 Economic conditions 39 Indexes 39 Correspondence 35 Church history 32 Colonies 29 Social conditions 29 Constitutional history 26 Education 25 History, Naval 25 World War, 1939-1945 25 Social life and customs 23 Civilization 21 History and criticism 21 Working class 20 Missions 19 Commerce 18 Communism 18 Description and travel 18 Historiography 17 Diaries 13 Manuscripts 13