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200 10$aConcentrations and possible sources of nitrate in water from the Silurian-Devonian aquifer, Cedar Falls, Iowa /$fby Bryan D. Schaap
210  1$aIowa City, Iowa :$cU.S. Department of the Interior, U.S. Geological Survey,$d1999.
215   $a1 online resource (iv, 19 pages) $ccolor illustrations, maps
225 1 $aWater-resources investigations report ;$v99-4106
300   $a"Prepared in cooperation with Cedar Falls Utilities, Iowa."
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