Browsing by Author "Pearson, Helga Sharpe, 1898-"
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Item Some skulls of Perchoerus (Thinohyus) from the White River and John Day formations. Bulletin of the AMNH ; v. 48, article 3.(New York : Published by order of the Trustees, American Museum of Natural History, 1923) Pearson, Helga Sharpe, 1898-