http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Title from PDF title screen (viewed June 2, 2009).
Mode of access: Internet from the USGS web site. Address as of 6/2/09: http://www.epa.gov/WaterSense/docs/ws%5Fsimplesteps508.pdf ; current access available via PURL.