TY  - RPRT
TI  - GIS Representation of Coal-Bearing Areas in Africa
AU  - Matthew D. Merrill
AU  - Susan J. Tewalt
PY  - 2008
DO  - 10.3133/ofr20081258
UR  - https://pubs.usgs.gov/publication/ofr20081258
ID  - ofr20081258
ER  -