DUPONT, É. - Les phénomènes généraux des cavernes en terrains calcareux et la circulation sousterraine des eaux dans la région Han-Rochefort. /&/ J/ Willems: CR sess. extraord.: Étude de la circulation de l'eau dans les calcaires et visite des grottes de la Lesse.

1893. Bull. Soc. Bwlge de Géol. Paléont. Hydrol. VII; pp. 190-297, 7 fig. 2 plts. h.t. with col. maps folding-out. /&/ pp. 298-378, 17 fig. Orig. extract from bound volume, plain new wrps. contents very good.

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