History 470 Spies 156 World War, 1939-1945 124 Secret service 106 HISTORY 102 Espionage 99 General 93 History and criticism 93 Politics and government 88 Intelligence service 84 Foreign relations 66 POLITICAL SCIENCE 64 Diplomatic relations 51 Cold War 47 Motion pictures 45 Histoire 43 Women 40 Criticism and interpretation 39 Social aspects 38 SOCIAL SCIENCE 37 BIOGRAPHY & AUTOBIOGRAPHY 34 Intelligence officers 30 Espionage, American 27 LITERARY CRITICISM 27 Women spies 27 Espionage, Soviet 26 Social conditions 26 War 26 Political aspects 25 Military intelligence 24