TY  - RPRT
TI  - GIS Representation of Coal-Bearing Areas in North, Central, and South America
AU  - Susan J. Tewalt
AU  - Scott A. Kinney
AU  - Matthew D. Merrill
PY  - 2008
DO  - 10.3133/ofr20081257
UR  - https://pubs.usgs.gov/publication/ofr20081257
ID  - ofr20081257
ER  -