http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Guidance for filtration and air-cleaning systems to protect building environments from airborne chemical, biological, or radiological attacks
Department of Health and Human Services.
National Institute for Occupational Safety and Health
Title from title screen (viewed on Jan. 12, 2006).
Mode of access: Internet from CDC web site. Address as of 11/17/06: http://www.cdc.gov/niosh/docs/2003-136/ (abstract), http://www.cdc.gov/niosh/docs/2003-136/pdfs/2003-136.pdf (PDF version); current access available via PURL.