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Mining and Concentration of Carnotite Ores

Description: From Preface: "Hence the authors have given detailed information in regard to many operations that might have given detailed information in regard to many operations that might receive little notice in an account of the mining of most metals, but the presentation of these facts in regard to carnotite is necessary because of their bearing on profitable mining and concentration, the utilization of low-grade ore, and the preservation of waste."
Date: 1917
Creator: Kithil, Karl L. & Davis, John A.
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Sandstone Quarrying in the United States

Description: From Preface: "It is the aim of this bulletin to point out in a general way the location of workable sandstone deposits in the United States, and to outline the most efficient and economical methods of quarrying and preparing the rock for structural and other purposes."
Date: 1917
Creator: Bowles, Oliver
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