1971 2 volumes (complete). xix, 694 p., num. figs, folded sections & pls, hardbound (small, repaired, tear in lower end spine volume 1). Trabajos de Geologia 3-4. Collection of 28 papers presented during the International Field Meeting on the Carboniferous of the Cordillera Cantabrica.
Paris - Bruxelles - Strasbourg, Franco-Suisse, 1934, in-4°, 1062 p. + 52 planches, reliure en toile originale.
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