1
The world's water. 2008-2009 : the biennial report on freshwater resources /
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“...UPN - Water protection, water quality, clean water...”
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The world's water. 2002-2003 : the biennial report on fresh water resources /
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“...UPN - Water protection, water quality, clean water...”
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The world's water. 2000-2001 : the biennial report on fresh water resources /
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“...UPN - Water protection, water quality, clean water...”
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Mindestanforderungen an das Einleiten von Abwasser in Gewässer - § 7a Wasserhaushaltsgesetz : allgemeine Rahmen-Verwaltungsvorschrift (Rahmen-AbwasserVwV) /
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1996
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Gewässergüte und Grundwasserschutz: erkennen, bewerten, verbessern : Essener Tagung. 0021 : Essen, 09.03.88-11.03.88.
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