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The base of the Nemagraptus gracilis Zone as the base of the global Upper Ordovician Series: Three potential stratotypes 专著章节/文集论文
出自: Sixth International Graptolite Conference and 1998 Field Meeting, IUGS Subcommission on Silurian Stratigraphy, Mineros:Temas Geologico - Mineros, ITGE 23, 1998, 页码: 148-151
作者:  Bergstrom, S.M.;  Finney, S.C.;  Chen Xu (陈旭);  Wang Zhi-hao (王志浩)
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