Selenium concentrations in irrigation drain inflows to the Salton Sea, California, October 2006 and January 2007 [electronic resource] / by Thomas W. May, Mike J. Walther, William G. Brumbaugh.
Mode of access: Internet from the USGS web site. Address as of 11/9/07: http://pubs.usgs.gov/of/2007/1113/pdf/OFR2007-1113.pdf; current access via PURL.
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Title from PDF title screen (viewed on June 4, 2007).