H. N. A. PRIEM; N. A. I. M. BOELRIJK; B. J. ROMEIN; E. A. T. VERDURMEN; R. H. VERSCHURE. 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, p. 205-207, 1 Jan. 1975.