External quality-assurance programs managed by the U.S. Geological Survey in support of the National Atmospheric Deposition Program/Mercury Deposition Network [electronic resource] / by Natalie E. Latysh and Gregory A. Wetherbee.
Mode of access: Internet from the USGS web site. Address as of 11/27/07: http://pubs.usgs.gov/of/2007/1170/pdf/of07-1170_508.pdf; current access via PURL.
Note
Title from PDF title screen (viewed on Sept. 17, 2007).