L. Hance, L. Dejonghe, and J.M. Graulich (1989)
Géologie de l'autoroute E42 "Verviers – Saint- Vith" à Heusy et à Ensival
Geological Survey of Belgium., vol. 1989/2 - N°237. Professional Paper of the Geological Survey of Belgium.
RBINS Publication(s)
56 pages, 16 figures
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