USGS abandoned mine lands research [electronic resource] : presented at the NAAMLP Meeting in Billings, Mont., Sept. 25, 2006 / by Kate Johnson and Stan Church.
Mode of access: Internet from the USGS web site. Address as of 10/2/07: http://pubs.usgs.gov/of/2006/1301/pdf/of06-1301_508.pdf; current access via PURL.
Note
Title from PDF title screen (viewed on Dec. 13, 2006).