http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Delineation of background laboratory contamination in the analysis of trace concentrations of extractable organic materials in crystalline rocks by Soxhlet extraction, column chromotography, and gas chromatography
1 online resource (43 pages) : illustrations.
Title from title screen (viewed on Jan. 26, 2015).
Includes bibliographical references (page 43).
U.S. Geological Survey open-file report ; 99-335