Published by United States Geological Survey., 1965
Seller: Eryops Books, Stephenville, TX, U.S.A.
No Binding. Condition: Very Good. Large folded sheet with a radioactive contour map and a magnetic contour map superposed on a generalized geologic map, and with a 3-page explanation of geology and geophysics; in printed envelope; ex-corporate library; in very good condition. Map.