Overburden above the Hanna 77, 78, 79 and 81 coal zones, Hanna Basin, Wyoming (ha*ovbg)
These ArcView shapefiles contain representations of the overburden thckness above the Hanna 77, 78, 79 and 81 coal zones in the Hanna coalfield, Hanna Basin, Wyoming.  These shapefiles were created specifically for the National Coal Resource Assessment in the Northern Rocky Mountains and Great Plains Region.