[Washington, D.C.] : U.S. Dept. of Health and Human Services, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health, [2007]
1 folded sheet 8 unnumbered pages : digital, PDF file
data file
OCLC
ocn261566533
Title from title screen (viewed Oct. 10, 2008).
"August 2004."
Mode of access: Internet from the CDC web site. Address as of 10/10/2008: http://www.cdc.gov/niosh/docs/2007-161/pdfs/2007-161.pdf; current access is available via PURL.