Copper Mining in North America (open access)

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
Mineral Industries Survey of the United States: California, Calaveras County, Mother Lode District (South). Mines of the Southern Mother Lode Region. Part 1 -- Calaveras County (open access)

Mineral Industries Survey of the United States: California, Calaveras County, Mother Lode District (South). Mines of the Southern Mother Lode Region. Part 1 -- Calaveras County

From Introduction: "The present paper discusses regional resources, chiefly of gold, the existence of which has long been demonstrated by substantial production but which are so nearly marginal in value that their mining has been protracted and will probably continue indefinitely for many decades."
Date: 1938
Creator: Julihn, C. E. & Horton, F. W.
System: The UNT Digital Library
Geologic Structure and Occurrence of Gas in Part of Southwestern New York: Part 1. Structure and Gas Possibilities of the Oriskany Sandstone in Steuben, Yates, and Parts of the Adjacent Counties (open access)

Geologic Structure and Occurrence of Gas in Part of Southwestern New York: Part 1. Structure and Gas Possibilities of the Oriskany Sandstone in Steuben, Yates, and Parts of the Adjacent Counties

From introduction: Since the discovery of the Wayne-Dundee gas field in 1930 and the more recent discovery of large quantities of gas in the Oriskany sandstone about 2 miles north of the village of Greenwood the search for similar favorable structural features has been greatly stimulated in the Finger Lakes region and southwestward to the Pennsylvania line. To aid those interested in the area to gain a clearer understanding of the regional structure and its relation to the subsurface structure, parties in charge of the senior author were assigned during the field seasons of 1934 and 1935 to make a geologic study of Steuben County and parts of the adjacent counties.
Date: 1938
Creator: Bradley, Wilmot H. & Pepper, J. F.
System: The UNT Digital Library
Revision of the North American Ground Squirrels: With a Classification of the North American Sciuridæ (open access)

Revision of the North American Ground Squirrels: With a Classification of the North American Sciuridæ

Summary of the geographic distribution, habits and economic relations, and descriptions of the subspecies of the North American Sciuridæ.
Date: April 1938
Creator: Howell, Arthur H.
System: The UNT Digital Library