Description
Item Description:Title from title screen (viewed on July 15, 2008).
"May 2002."
Electronic resource.
Physical Description:17 pages : digital, PDF file.
Format:Mode of access: Internet at the National Institute for Occupational Safety and Health web site. Address as of 7/15/08: http://www.cdc.gov/niosh/mining/pubs/pdfs/ri9657.pdf ; current access available via PURL.