Water quality and aquatic toxicity data of 2002 spring thaw conditions in the upper Animas River watershed, Silverton, Colorado [electronic resource] / by D.L. Fey ... [et al.].
Imprint
[Reston, Va.] : U.S. Dept. of the Interior, U.S. Geological Survey, 2002.
Mode of access: Internet from the USGS web site. Address as of 3/5/03: http://pubs.usgs.gov/of/2002/ofr-02-488/OFR-02-488-508.pdf; current access is available via PURL.