For information on historic asbestos mines, historic prospects and natural asbestos occurrences in the U.S., see:
Eastern U.S. ---> Open-File Report 2005-1189 (http://pubs.usgs.gov/of/2005/1189/);
Central U.S. ---> Open-File Report 2006-1211 (http://pubs.usgs.gov/of/2006/1211/);
Rocky Mountain States ---> Open-File Report 2007-1182 (http://pubs.usgs.gov/of/2007/1182/);
Southwest U.S. ---> Open-File Report 2008-1095 (http://pubs.usgs.gov/of/2008/1095/).
For commodity statistics and information see: http://minerals.usgs.gov/minerals/pubs/commodity/asbestos/