Author: KIER, P.M.
Title: Upper Miocene echinoids from the Yorktown Formation of Virginia and their environmental significance.
Description: 1972. Smithsonian Contr. Paleobiology Nr. 13; 41 pp. 6 fig. 10 plts. Orig. wrps. front cover and first 2 pages with cut off balnc corner, otherwise very good, sm4to.

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