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Allen, J. A. 1874. On geological variation in color among North American squirrels; with a list of the species and varieties of the American Sciuridae occurring north of Mexico. Proceedings of the Boston Society of Natural History 16:276–295.

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    On geological variation in color among North American Squirrels; with a list of the species and varieties of the American Sciuridae occurring north of Mexico

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    On geological variation in color among North American Squirrels; with a list of the species and varieties of the American Sciuridae occurring north of Mexico