“The European Thesaurus on International Relations and Area Studies is a multi-lingual thesaurus containing ca. 8000 hierarchically arranged terms. It covers all the main aspects of the subject area of international relations and area studies.”
For online search of the databases maintained at the International Relations and Area Studies Gateway (IREON). “The International Relations and Area Studies Gateway is a product of leading German and international research institutes working in the fields of foreign and security policy and development policy. Their libraries and documentation centres form the Information Network International Relations and Area Studies (FIV-IBLK) consortium. FIV-IBLK provides specialist information for research, education and policy-making, thus fulfilling the role of a national information resource as outlined in the 1974 Information Programme of the German Federal Government, now under the auspices of the Deutsche Forschungsgemeinschaft (DFG).”
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http://www.ireon-portal.de