U.S. DEPARTMENT OF THE INTERIOR
U.S. GEOLOGICAL SURVEY
OPEN-FILE REPORT 95-631
PLATE 4 OF 8 - Coal Fields and The National Wilderness Preservation System
U.S. Department of the Interior, U.S. Geological Survey
URL: http://pubs.usgs.gov/of/1995/of95-631/PLATE4/plate4.htm
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