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Rhine-Meuse Rivers
Royal Netherlands Institute for Sea Research
http://www.nioz.nl
Rhine-Meuse delta studies- Utrecht University
http://www.geo.uu.nl/fg/palaeogeography
Geological Survey of the Netherlands
http://www.tno.nl/content.cfm?context=markten&content=product&laag1=187&laag2=277&item_id=722