History 29 Foreign relations 13 History and criticism 8 Political aspects 6 Politics and government 6 Government policy 5 Social aspects 5 American literature 4 Cold War 4 Economic conditions 4 Addresses, essays, lectures 3 American fiction 3 National security 3 Bonds 2 Border patrols 2 Boundaries 2 Case studies 2 Credit ratings 2 Drug traffic 2 English literature 2 Espionage in literature 2 Illegal aliens 2 Industrial relations 2 International finance 2 Journalism 2 Literature and history 2 Military intelligence 2 Modernism (Literature) 2 Nuclear arms control 2 Nuclear nonproliferation 2