http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Assessment of undiscovered oil and gas resources of the Illinois Basin, 2007
"National assessment of oil and gas fact sheet."
Title from title screen (viewed on Aug. 21, 2007).
Mode of access: Internet from the USGS web site. Address as of 8/21/07: http://pubs.usgs.gov/fs/2007/3058/fs2007-3058.pdf ; current access via PURL.
National assessment of oil and gas fact sheet
Fact sheet (Geological Survey (U.S.)) ; 2007-3058