Periodicals Encyclopedias and directories -- 7 Periodicals -- 6 Economic conditions -- 4 Economic forecasting -- 3 Foreign relations -- 3 Congresses 1 more ... Defenses -- 1 Economic conditions - -- 1 Encyclopedia and directories -- 1 Forecasting -- 1 International relations -- 1 Military policy -- 1 National security -- 1 Politics and government -- 1 Yearbook 1 less ...