Author: GRAULICH, J.-M.
Title: Recherches géologiques sur les terrains paléozoïques des environs de Spa.
Description: 1949. Soc. Géol. Belg. 72 Mém. 1; pp. 93-119, 8 fig. 1 plt. with geol. sections, 1 plt. folding-out with geol. map 1:20.000. Orig. extract, plain new wrps. very good.

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