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Resources of the United States, 1910. Part I.— Metals. Pp. 1-796, figs., pi. i, 



U.S. Copper Districts. 8vo. Washington. 1911. 

 . . ' 2. . , 1909. Part II.— Xon-Metals. P P . 1-942. figs. 



Svo. Washintrton. 1911. 

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pis. i-xvii. 8vo. Washington, 1911. 



