http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
measuring the pulse of our nation's rivers
National Streamflow Information Program (Geological Survey (U.S.))
Also available via Internet from the USGS web site. Address as of 10/31/02: http://water.usgs.gov/nsip/pubs/nsip-2page.pdf ; current access is available via PURL.