From Introduction: "An investigation by diamond drilling was undertaken by the Bureau of Mines at the instance of officials of the State of North Carolina to determine the thickness and continuity of the coal beds, physical conditions in and surrounding the beds that would influence mining, and the petrographic and chemical characteristics of the coals."
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Added Title:
United States Bureau of Mines Bulletin 515
Description
From Introduction: "An investigation by diamond drilling was undertaken by the Bureau of Mines at the instance of officials of the State of North Carolina to determine the thickness and continuity of the coal beds, physical conditions in and surrounding the beds that would influence mining, and the petrographic and chemical characteristics of the coals."
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Toenges, Albert L.; Turnbull, Louis A.; Shields, Joseph J.; Haley, Wilbur A.; Parks, B. C.; Abernethy, Roy F. et al.Coal Deposits in the Deep River Field, Chatham, Lee, and Moore Counties, N.C.,
report,
1952;
Washington D.C..
(https://digital.library.unt.edu/ark:/67531/metadc12674/:
accessed July 10, 2025),
University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu;
crediting UNT Libraries Government Documents Department.