미국
Data point (drill locations) locations used in assessing coals in the Yampa coal field (yam*ptg)
These are shapefiles and coverages of data points used in the assessment of coal zones A, B, C, and D in the Yampa coal field, northwestern Colorado. There are four separate shapefiles, one for coal zone. Yama_pts is for the A coal zone, yamb_pts is for the B coal zone, etc.