Author: LASNE, H.
Title: Sur les terrains phosphatés des environs de Doullens. Etage Sénonien et terrains superposés. [3 parts].
Description: 1890-1894. Bull. Soc. Géol. France (3) XVIII, XX & XXII ; pp. 441-491, 4 fig. 2 plts. h.t. with map & geol. sections folding-out, loosely inserted, pp. 211-236, 6 fig. & pp. 345-354, 3 fig. Orig. extracts, stapled, as such very good.

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