Author: Mitchell C. E. & Bergström S. M.,
Title: Three-dimensionally preserved Richmondian Graptolites fom Southwestern Ohio and the Graptolite correlation of the North American Upper Ordovician Standard
Description: 1977. In 4to, offp., pp. 14, with 6 figs, and 2 pls. Disbound from Boll. Soc. Pal. It., 16(2)

Keywords: paleontology - fossils graptolites Hemichordata


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