Title from PDF title screen (viewed on Mar. 13, 2007).
"USGS Toxic Substances Hydrology Program."
Includes bibliographic references (pages 5-6).
Mode of access: Internet from the USGS web site. Address as of 1/23/08: http://pubs.usgs.gov/ds/2006/198/pdfs/jgs%5Fweb%5Fwhole.pdf; current access via PURL.