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Publication Extents

Not all publications have extents, not all extents are completely accurate
Map showing high-purity quartzite in California, Nevada, Utah, Idaho, and Montana
Keith B. Ketner
1976, Miscellaneous Field Studies Map 821
Unusually pure quartzite of Ordovician age crops out in hundreds of places from Owens River, California to southwestern Montana.  It constitutes a single lithologic type that is called the Kinnikinic Quartzite in central Idaho, the Swan Peak Quartzite in southeastern Idaho and adjacent parts of Utah, and the Eureka Quartizite...
Map of coal-mining features, Allegheny County, Pennsylvania
W.E. Davies, J. S. Pomeroy, W. R. Kohl
1976, Miscellaneous Field Studies Map 685-C
This map is one result of a series of studies sponsored by the Appalachian Regional Commission as part of a larger U.S. Geological Survey program of environmental analysis of a part of southwestern Pennsylvania. The map summarizes surface features resulting from coal mining. The distribution of surface features is largely...