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APPENDIXl Sampl<strong>in</strong>g data Rh<strong>in</strong>e (Lobith) <strong>and</strong> <strong>Meuse</strong> (Eijsden) March 1997 A ril1997 May 1997 June 1997 July 1997 Au ust 1997 September 1997 October 1997 November 1997 December 1997 January 1998 February 1998 26-03 22-04 20-05 18-06 16-07 13-08 10-09 08-10 05-11 03-12 30-12-1997 28-01-1998 25-03 22-04 20-05 17-06 15-07 12-08 09-09 07-10 04-11 02-12 29-12-1997 27-01-1998 30 RIW'A