“Drifting Peat and Subterranean Forest: Nicolaas Witsen, the Landscape of Amstelland and the Basic Principles of Modern Geology”. Bulletin KNOB 118, no. 1 (March 15, 2019): 33–54. Accessed April 21, 2026. https://bulletin.knob.nl/index.php/knob/article/view/172.