R. W. Faas, and S. Wartel. “Mud Is Transported to the Dutch Delta Area from the Rhine, Waal, Maas and Scheldt Rivers (resp. 0,6; 2,5; 0,7 and 0,7 Million tons/Year). Above, in the Rotterdam Waterway about 3,5 Million Tons of Mud Per Year Are Brought in from the Sea. The Mud of the U”. Netherlands Journal of Geosciences (January 1, 1977): 211-218. Accessed April 27, 2026. https://njgjournal.nl/index.php/njg/article/view/14318.