Ostend: sheet 52°N/02°E.
Solid Geology, 1:250 000 series British Geological Survey, Geological Survey of The Netherlands & Belgian Geological Survey.
Balson, P.S., C. Laban, P.J. Frantsen, N. Parker, J.P.Henriet, M. de Batist & F. Mostaert, 1991
Solid Geology, 1:250 000 series British Geological Survey, Geological Survey of The Netherlands & Belgian Geological Survey.
Balson, P.S., C. Laban, P.J. Frantsen, N. Parker, J.P.Henriet, M. de Batist & F. Mostaert, 1991