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Copper Mining in North America
From introduction: "In this paper are assembled and summarized many subjects relating to the copper industry in North America. Production of mines and districts, history of the industry in North America. Production of mines and districts, history of the industry, geology, of the principal deposits, and mining methods and costs are discussed."
Date:
1938
Creator:
Gardner, E. D.; Johnson, C. H. & Butler, B. S.
System:
The UNT Digital Library
Gypsum Products: Their Preparation and Uses
Technical report issued by the Bureau of Mines over the different uses of gypsum. The sources and uses of gypsum are presented and discussed. This report includes tables, photographs, and illustrations.
Date:
July 1917
Creator:
Stone, Ralph W.
System:
The UNT Digital Library