1978-1980 26 p. [5, 8, 4, 4, 5], 19 plates [3, 6, 2, 4, 4], 4to, blind half cloth over plain boards. Published in: De Kreukel. In Dutch.Well-illustrated by Cor Karnekamp. The initial paper titled differently: Twee zeer goede ontsluitingen in het Lutetien (Eoceen) N.W. van Parijs. In the rear three more papers on molluscs from the Parisian Lutetien (by Karnekamp, and by Van Nieulande, with another 11 plates.