H. N. A. Priem, N. A. I. M. Boelrijk, B. J. Romein, E. A. T. Verdurmen and R. H. Verschure 1975. Title Year Authors Vol (No) Abstract The Calais deposits in the vicinity of Wieringen and the geogenesis of Northern North Holland 1975 Ente, P.J.; Zagwijn, W.H.; Mook, W.G. 54(1-2) Based upon lithologic data and radiocarbon datings the lithostratigraphy . Netherlands Journal of Geosciences. (Jan. 1975), 205-207.