Denver, CO : U.S. Geological Survey, Branch of Information Services [distributor].
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Book
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Full Title:
Delineation of the Troy Bedrock Valley and particle-tracking analysis of ground-water flow underlying Belvidere, Illinois / by P.C. Mills, K.J. Halford, and R.P. Cobb ; in cooperation with the Illinois Environmental Protection Agency [and] U.S. Environmental Protection Agency
Also available via Internet from the USGS web site. Address as of 8/18/08: http://il.water.usgs.gov/pubs/wrir02%5F4062.pdf ; current access available via PURL.