Yampa coal field combined leased areas and mined-out areas, Colorado Plateau (yam*leasg)

These are shapefiles and coverages that represent areas of
combined State and Federal coal leases and mined-out areas
in the Yampa coal field. Yamaleasg contains polygons for
which resources were not calculated for the A coal zone.
Yambleasg contains polygons for which resources were not
calculated for the B coal zone, etc.