SINGER, D. A.; COX, DENNIS P.; DREW, LAWRENCE J.; CHAFFEE, MAURICE A. - Grade and Tonnage Relationships Among Copper Depostits -and- Geochemical Exploration Techniques Applicable in the Search for Copper Deposits (Geological Survey Professional Paper 907-a, B)

Washington: United States Government Printing Office, 1975. Stapled wraps. A single USGS booklet covering two studies of the means and practicality of mining copper deposits. With tables, charts and a few black & white photos. --- In grey stapled wraps with an array of images of various metallic ore samples. --- With color highlighting on one page in the second study, otherwise a clean, bright, unmarked copy.; Quarto - 11 to 13 in. tall; vii, 11, iii, 26 pages. Very Good .

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