Iowa City, Iowa : U.S. Dept. of the Interior, U.S. Geological Survey, 2001
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Book
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Full Title:
Benthic invertebrate assemblages and their relation to physical and chemical characteristics of streams in the Eastern Iowa basins, 1996-98 / by Allison R. Brigham and Eric M. Sadorf
Mode of access: Internet from the USGS web site. Address as of 10/27/08: http://pubs.usgs.gov/wri/2000/wri004256/pdf/wri004256.pdf ; current access available via PURL.