Nitrate nitrogen in Iowa rivers :
long-term trends /
[prepared by Iowa Department of Natural Resources, Geological Survey Bureau ; photos by Gary Hightshoe].

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Related Names
Hightshoe, Gary L.
Iowa. Department of Natural Resources.
Language(s)
English
Published
[Iowa City, Iowa : Iowa Department of Natural Resources, Geological Survey Bureau, 2001]
Subjects
Water quality management > Iowa.
Water > Nitrogen content > Iowa.
Note
Depository.
Caption title.
"March 2001."
Also available online.
Physical Description
1 folded sheet ([4] p.) : col. ill. ; 28 cm.
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