Roger Clark Wells

The Fractional Precipitation of Some Ore-forming Compounds at Moderate Temperatures

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Analyses of Rocks and Minerals from the Laboratory of the United States Geological Survey, 1914-36

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Relative Abundance of Nickel in the Earth's Crust

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Select Bibliography of the Literature Dealing with the Relation of Radioactivity to Geological Problems

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Electric Activity in Ore Deposits

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Bibliography of the Metals of the Platinum Group

Platinum, Palladium, Iridium, Rhodium, Osmium, Ruthenium, 1748-1917

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Relative Abundance of Nickel in the Earth's Crust

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Geology and Ore Deposits of the Metaline Quadrangle, Washington

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Minerals of the Montmorillonite Group

Their Origin and Relation to Soils and Clays

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Revision of the Lower Eocene Wilcox Flora of the Southeastern States

With Descriptions of New Species, Chiefly from Tennessee and Kentucky

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Standard Test Specimens of Zinc Bronze (Cu88, Sn10, Zn2)--Parts I and II.

Part I.--Preparation of Specifications, by C.P. Karr, Associate Physicist. Part II.--Microstructure, by Henry S. Rawdon, Assistant Physicist, Bureau of Standards

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Water-laid Volcanic Rocks of Early Upper Cretaceous Age in Southwestern Arkansas, Southeastern Oklahoma and Northeastern Texas

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