Precambrain Geology of the United States: An Explanatory Text to Accompany the Geologic Map of the United States; Geological Survey Professional Paper 902
Washington: United States Government Printing Office, 1976. softcover, stapled binding, 11.5" x 9", 85 pages, illustrated. very good. Item #5568343
from the abstract, "Precambrian rocks are the surface in about 10 percent of the area of the United States but are more extensive beneath thePhanerozoic rocks, especially in the Central Interior Region." DP1.
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