Martin Rappol, Bert de Leeuw and Jacomina Swaan (1991) “Distribution and composition of till on Wieringen and in the northern part of the Wieringermeer, The Netherlands”, Netherlands Journal of Geosciences, pp. 129-142. Available at: https://njgjournal.nl/index.php/njg/article/view/12793 (Accessed: 4April2026).