J.-M Graulich (1980)
SONDAGES D'ETUDE DU VIADUC DE PRAYON
Geological Survey of Belgium Professional Paper, vol. 1980/6C N.176 p.
02930, 134, 135, Lg, SYNVE, 1, DEV, DEVINF, E, CO, DEVMOY, GI, DEVSUP, CARB, TN, NM, F, FA, ING, SON, TEC
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