Bradbury, J.P., & Krebs, W.N., 1995.: - The diatom genus Actinocyclus in the Western United States. A. Actinocyclus (acillariophyta) species from the lacustrine Miocene deposits [...]. / B. Geologic ranges of the Actinocyclus species [...]. {U.S. Geol. Surv. Prof. Pap., 1543A-B.]

Washington 1995. 4to. Pp. viii,72, 15 plates of microphotos, 3 figs., refs. Orig. wrappers.

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