International relations 6 Foreign relations 5 Armed Forces 4 Education 4 Electric utilities 4 Finance 4 Mathematical models 4 more ... Rates 4 Nuclear arms control 3 Appropriations and expenditures 2 Arms control 2 Case studies 2 Defenses 2 Deterrence (Strategy) 2 Economic aspects 2 Expenditures, Public 2 Federal aid to education 2 Government spending policy 2 Infants 2 International economic relations 2 Labor supply 2 Local taxation 2 Mathematics teachers 2 Military assistance 2 Military policy 2 Mortality 2 National security 2 Nuclear crisis control 2 Nuclear warfare 2 Science teachers 2 less ...