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La cartographie géotechnique et les problèmes historiques de la région de Mons in The engineering geology of ancient works, monuments and historical sites : preservation and protection.
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to be drawn that show the cut-and-fill areas, the place where old quarries and mines were situated, tunnels and underground channels, levelled ash heaps, mine settlements, the base and levelling courses of fortifications. Several examples are given. - (Author).