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  Partner: UNT Libraries Government Documents Department
 Country: Mexico
 Decade: 1930-1939
 Language: English
Copper Mining in North America

Copper Mining in North America

Date: 1938
Creator: Gardner, E. D.; Johnson, C. H. & Butler, B. S
Description: 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."
Contributing Partner: UNT Libraries Government Documents Department
Stopping Methods and Costs

Stopping Methods and Costs

Date: 1936
Creator: Jackson, Charles Freeman & Gardner, E. D.
Description: None
Contributing Partner: UNT Libraries Government Documents Department