History 1,784 Politics and government 468 Foreign relations 146 Social conditions 146 World War, 1939-1945 89 Economic conditions 74 Nationalism 66 Sources 65 Women 47 Addresses, essays, lectures 46 Civilization 46 Social life and customs 45 Labor and laboring classes 37 Communism 35 History, Military 33 Diplomatic history 32 Political activity 32 Cities and towns 31 Jews 30 Colonies 29 Historiography 27 World War, 1914-1918 25 Ethnic relations 24 National socialism 23 Political parties 23 Radicalism 23 Social aspects 23 Fascism 22 Philosophy 20 Political science 20