HAMMEN, TH. VAN DER - El desarrollo de la flora Colombiana en los periodos geologicos. I. Maestrichtiano hasta Terciario mas inferior.

1954. Bogota, Boletin Geologico II-1; pp. 49-106, 7 plts. h.t. with figs. 21 plts. h.t. with drawings of palynomorphs. Orig. wrps. complete issue (110 pp.), libr. stamp on cover and title page, contents very good, 4to.

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