Unioned layer of coal resource calculation in the Danforth Hills coal field, Colorado (dan*fing)

Final unioned polygon coverages and shapefiles used to
calculate coal resources of the A through G coal zones,
Danforth Hills coal field, northwestern Colorado. Danafing
was used for the A coal zone; Danbfing was used for the B
coal zone; etc. Polygons that make up the final unioned
polygons include counties, 7.5' quadrangles, townships,
surface and coal ownership, lease boundaries, overburden,
and coal thickness categories. The final coverages were
clipped to the resource areas for each coal zone, which are
described in the metadata files for the *_bnd coverages.