Author: AMEROM, H.W.J. ET AL.
Title: Some paleontological and stratigraphical aspects of the Upper Carboniferous Sama Formation (Asturias, Spain).
Description: 1970. Meded. Rijks geol. Dienst NS 21; pp. 9-79, 52 fig. 10 plts. h.t. with ostracods, brachiopods and molluscs. Extract without covers, 4to.

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