Bürgl, H., 1954.: - El Cretaceo Inferiór en los aldredores de Villa de Leiva (Boyaca). // El Cretaceao Superior de la Region de Girardot.

Bol. Geol. [Bogotá], 11(1): pp. 5-22;23-48, 12 fold. plates of maps, sections and diagrs., 12 photos, bibliogr. 4to. Two papers in one volume, new plain wrappers. - Detailed litho- and biostratigraphy.

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