http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Radioactive elements in coal and fly ash
abundance, forms, and environmental significance
Title from title screen (viewed on July 9, 2004).
Mode of access: Internet from the USGS web site. Address as of 7/9/04: http://greenwood.cr.usgs.gov/energy/factshts/163-97/FS-163-97.pdf; current access is available via PURL.
Radioactive elements in coal and fly ash : abundance, forms, and environmental significance
Fact sheet (Geological Survey (U.S.)) ; FS-97-163