The diatom genus Actinocyclus in the western United States. A. Actinocyclus species from lacustrine Miocene deposits of the western United States, B. Geologic ranges of lacustrine species, western United States.
1995. United States Geological Survey Prof. Pap. 1543-A&B; 73 pp. 3 fig. 16 plts. Orig. wrps. with libr. ticket in corner of front cover, otherwise very good, lg4to.
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