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Excerpt from U. S. Department of Agriculture Division of Ornithology and Mammalogy, Vol. 4: North American Fauna
The present paper is based on the study of 39 Skins and 38 skulls, de rived from the following sources: U. S. National Museum 8 skins and 9 skulls; Department of Agriculture series, 12 skins and 11 skulls; Merriam collection, 19 Skins and 18 skulls.
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