http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Environmental characteristics and water quality of hydrologic benchmark stations in the United States, 1963-95
Introduction to circular -- Analytical methods -- Circular 1173-A. HBN in the eastern U.S. -- Circular 1173-B. HBN in the midwestern U.S. -- Circular 1173-C. HBN in the west-central U.S. -- Circular 1173-D. HBN in the western U.S.
Also available via Internet from the USGS web site. Address as of 7/28/08: http://pubs.usgs.gov/circ/circ1173/ ; current access available via PURL.