Author: Gürich, G., 1906.:
Title: Les spongiostromides du Viséen de la province de Namur. [Mém. Mus. Roy. Hist. Nat. Belgique, 3(12).]
Description: Bruxelles. Large 4to. Pp. 55, several (micro)photos on 23 pls., 1 fig., bibl. Orig. wrs. Neat repair to covers and spine, contents good. - Lower Carboniferous stromatoliths.

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