172 THE WHITE RIVER BADLANDS 



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Holland, W. J. and Peterson, O. A. The Osteology of 

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Peterson, O. A. The Osteology of Promerycochoerus. 

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Cook, H. J. Notes on the Geology of Sioux County, 

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Matthew, W. D. The Tertiary Sedimentary Record 

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Scott, W. B. The Isthmus of Panama in Its Relation 

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Troxell, E. L. An Early Pliocene One-Toed Horse, 

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O'Harra, Cleophas C. A Bibliography of the Geology 

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