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Collection of digital structure contour maps from previously published USGS studies
Under the direction and funding of the National Cooperative Geologic Mapping Program (NCGMP) with guidance and encouragement from the United States Geological Survey (USGS),... -
Digital data of isopach contours and salt extent boundaries from previously...
This GIS dataset presents contours and maps from previously published interpretations of hydrogeologic units of the northern Great Plains by Downey (1986). The original source...