US Bureau of Mines 1941/42 Report order of Explosives & 1930 Mining Practices Pecos Mine

order Two vintage United States Bureau of Mines reports...
~US Department of Interior, Harold L Ickes, Secretary, Bureau of Mines, R.R. Sayers, Director, REPORT OF INVESTIGATIONS, Annual Report of the Explosives Division, Fiscal Year 1941 by Wilbert J. Huff (January 1942). R. I. 3602
Stamped California State Division Mines- Received Mar 19 1942 Library, San Francisco, California. "Duplicate" is handwritten in pencil on the cover.
36 pages, good vintage condition with some light discoloration and a small tear on the back page.
~Department of Commerce, United States Bureau of Mines, Scott Turner, Director, INFORMATION CIRCULAR, Mining Practice at the Pecos Mine of the American Metal Co of New Mexico, by J.T. Matson and C. Hoag (September 1930). I.C. 6368
22 pages, this one has a little more age wear and writing on the cover. Please see all photos.
Both are 8" x 10 1/2".

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