USGS river ecosystem modeling : where are we, how did we get here, and where are we going? : a report from the USGS River Ecosystem Modeling Work Group / by Leanne Hanson [and others].
Imprint
Reston, Va. : U.S. Dept. of the Interior, U.S. Geological Survey, 2009.
Mode of access: Internet from the USGS web site. Address as of 6/10/09: http://pubs.usgs.gov/sir/2009/5018/pdf/SIR09-5018.pdf; current access available via PURL.
Note
Title from PDF title screen (viewed June 10, 2009).