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《BMJ (Clinical research ed.)》1904,1(2269):1519-1520
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Roger Schallreuter 《Pal?ontologische Zeitschrift》1981,55(3-4):209-218
The problematicumAncientia Ross, 1967, hitherto known only from the Upper Ordovician of Ohio, is described for the first time from the Middle and Upper Ordovician of Europe. Three species are new. 相似文献
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