Editore: USGS/Government Printing Office, Washington D. C., 1968
Condizione: very good. from the abstract, "Analyses of 82 samples collected from the surface of the continental shelf between the Oregon-California border and Eureka, Calif., indicate that the background gold content on this shelf is about 0.1 ppm (part per billion)." DZ4. softcover, 10.5" x 8", 9 pages, name written on cover.
Editore: United States Geological Survey/USGS/Government Printing Office/GPO, Washington, DC, 1968
Da: Robert Gavora, Fine & Rare Books, ABAA, Talent, OR, U.S.A.
Soft cover. Appraisals were undertaken on areas of the continental shelf that lie offshore from mining districts on land that in the past had produced significant quantities of metals. Nine pages with maps and tables. Bound in original stapled yellow thick paper covers lettered in black. Name on the front cover. A fine copy. Book.