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Die Naturwissenschaften|February 5, 2002
Elbe river flood peaks and postwar agricultural land use in East GermanyR R van der Ploeg, P SchweigertThescientificworldjournal|June 14, 2003
Use and misuse of nitrogen in agriculture: the German storyR R van der Ploeg, P Schweigert, J BachmannPageof 1