http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Herbicides and nitrates in the Iowa River alluvial aquifer prior to changing land use, Iowa County, Iowa, 1996
4 unnumbered pages : color illustrations, color maps ; 28 cm.
Includes bibliographical references (page [4]).
Fact sheet (Geological Survey (U.S.)) ; FS 97-085