1.
Geophysical approach of Pb-Zn mineralization of the Verviers synclinorium (Belgium) ; Approche géophysique des minéralisations Pb-Zn du synclinorium de Verviers (Belgique)
2.
Geophysical Investigation of the Pb-Zn deposit of Plombières, Belgium
Electromagnetic survey of the Pb-Zn deposit of Lontzen, Belgium
Geophysical Investigation of the Pb-Zn deposit of Lontzen, Belgium
Electromagnetic Investigation of the Pb-Zn deposit of Lontzen, Belgium