RECENT PUBLICATIONS
GIS Representation of Coal-Bearing Areas in Africa, 2008:
USGS Open-File Report 2008-1258
GIS Representation of Coal-Bearing Areas in North, Central, and South America, 2008:
USGS Open-File Report 2008-125
Large-scale digital geologic map databases and reports of the North Coal District in Afghanistan, (2008):
USGS Data Series 317 (dual-layer DVD-ROM).
RELATED LINKS
American Society of Testing Materials (ASTM):
Non-USGS Website