Author: Geukens, F.
Year: 1961 Publisher: Brussel : Paleis der Academiën,

Authors: Beugnies, Alphonse --- Dumont, P. --- Geukens, F. --- Henry, J. L. --- Melou, M. --- et al. Nion, J. --- Le Menn, J. --- Racheboeuf, P. R. --- Coen, M. --- Coen-Aubert, Marie --- Cornet, P. --- Babin, Claude --- Goujet, D. --- Lardeux, H. --- Johnson, George Anthony Lobjoit --- Charpentier, Jean-Luc --- Lethiers, Francis --- Tamain, Guy --- Conil, Raphaël --- Groessens, Eric --- Pirlet, H. --- Vachard, Daniel --- Lys, Maurice --- Coulon, Michel --- Crousilles, Michel --- Dixsaut, Christophe --- Sanchez de Posada, L. --- Garcia-Alcalde, J. L. --- Arbizu, M. A. --- Société géologique du Nord
Year: 1976 Publisher: Villeneuve d'Ascq : Société géologique du Nord,