Photogeologic Map of the Elk Ridge - 2 Quadrangle, San Juan County, Utah (United States Geological Survey Miscellaneous Geologic Investigations Series Map I-7). (Although map and envelope designates this as Elk Ridge 2, someone has inked in "Elk Ridge 1 NW" on envelope).
R. J. Hackman.
Sold by Eryops Books, Stephenville, TX, U.S.A.
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