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Esakova, N. V. and E. A. Zhegallo: Biostratigraphy and Fauna of Lowe Cambrian of Mongolia. The Joint Russian-Mongolian Paleontological Expedition, Transactions,46. 1996. 24 photographic plates. 214 p. gr8vo. Paper bd. - In Russian, with Latin nomenclature and Engl. table of contents. (77901) 75.97
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