R.T. van Balen, and F.S. Busschers. “Human Presence in the Central Netherlands During Early MIS 6 (~170-190 Ka): Evidence from Early Middle Palaeolithic Artefacts in Ice-Pushed Rhine-Meuse Sediments”. Netherlands Journal of Geosciences 89 (July 1, 2010): 77 - 83. Accessed March 31, 2026. https://njgjournal.nl/index.php/njg/article/view/12003.