Rueda-Gaxiola, J., 1969.: - Una nueva clasificación morfológico-sistematico para polenosporas fósiles. Nomenclatura y parataxonomïa. [Publ. Inst. Mexic. Petroleo, 68 AG/048.]

México. 4to. Pp. [4],viii,153, numerous figs., 17 (part;ly fold.) tables of which 2 in pocket, bibliogr. of 482 refs. Orig. wrappers. One corner a little bumped, spine repaired, good otherwise.

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