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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
United States Earthquakes, 1944
Report discussing earthquake activity in the United States during 1944. The report is broken down by regions and has sections for specific earthquakes.
Date:
1944
Creator:
unknown
System:
The UNT Digital Library