Chimay - Couvin. Carte géologique de Wallonie à l'échelle 1:25.000. 57/7-8 Notice explicative ; Chimay - Couvin. Geological map of Wallonia at the scale of 1:25.000. 57/7-8. Leaflet

New geological map of Wallonia published at the scale of 1/25.000, based on a new field work and using previous scientific data produced since the previous edition of Forir, published in 1900 at the scale of 1/40.000 by the "Commission Géologique de Belgique". The explanation notice by Maillieux has been published in 1912 by the Belgian Geological Survey. ; Révision de la carte géologique de Wallonie - Recherche collective d'intérêt général