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Reston, Va.: U.S. Department of the Interior, U.S. Geological Survey, 2018
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Paris, janvier 2017
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Washington/D.C: Congressional Research Service, 2013
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Hannover: BGR, 2011 ; Online-Ausg.
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Aylesbury: Oakdene Hollins Ltd, 2010
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Hannover: BGR, 2009 ; Online-Ausg.
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Reston, Va: U.S. Dept.of the Interior, U. S. Geological Survey, 2002
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London: BP, 2014
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Australian Trade and Investment Commission, march 2019
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Hannover: BGR, may 1, 2016
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Washington/D.C, 2011 ; Online-Ausg.
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Berlin-Spandau: Deutsche Rohstoffagentur (DERA) in der Bundesanstalt für Geowissenschaften und Rohstoffe (BGR), 2018
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Wuppertal, 2014
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Reston, Va: U.S. Dept. of the Interior, U.S. Geological Survey, 2011
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Hannover, 2010 ; Online-Ausg.
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Berlin: DERA, 2015
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Washington/D.C, 2012
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Washington, DC: U.S. Govt. Accountability Office, [2010]
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Berlin: DERA, 2023
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Berlin: DERA, 11.01.2017