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ADDITIO AL COPIES OF THIS PUBUCATION XAY BE PROCURED FROX THE SUPERINTENDENT OF DOCUMENTS (1927)

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by U. S. Geological Survey , Geor~re Otis Smith , Leadville Mi I G District , Color Do , S. F. Emmo Rs , J. D. Irvi G , D G. F. Loughlin , Wa Hi Gton , Washington D. C , P Age