HAMMEN, TH. VAN DER - A palynological systematic nomenclature /&/ Description of some genera and species of fossil pollen and spores.

1956. Colombia Inst. Geol. Nac. Bol. Geologico IV-2/3; pp. 63-102 & 111-117, the same in Spanish: pp. 23-62 & 103-110, 12+2 plts. In complete journal issue, orig. wrps, spine worn, contents very good, 4to.

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