M. Dusar and D. Lagrou (2008)
The underground quarries of Hinnisdael at Vechmaal (MunicpalityHeers, Belgian Limburg): geology, mining, risks, geoheritage.
In: Silvertant, J. & Ni Mhairtin, J., 3rd International Symposium on Archaeological mining history., pp. 53-58, Institute Europa Subterranea, Maastricht.
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