Agricultural land use and its relationship to nutrient levels in four eastern Iowa river systems /Author: Weldon, Mark Benesh.
Publisher: [Place of publication not identified] : [publisher not identified],
Date: 2007. This title can be found in 1 Iowa libraries.
Relating ambient nitrogen concentration to watershed characteristics in Iowa /Author: Yang, Xiaoying.
Publisher: [Place of publication not identified], Ill., col. maps
Date: 2005 : This title can be found in 1 Iowa libraries.
Nitrate nitrogen in Iowa rivers : long-term trends /Publisher: [Iowa City, Iowa : Iowa Department of Natural Resources, Geological Survey Bureau,
Date: 2001] This title can be found in 2 Iowa libraries.
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