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1 Kalkhoff, S. J.. 1993. Using a geographic information system to determine the relation between stream quality and geology in the Roberts Creek watershed, Clayton County, Iowa. Water Resources Bulletin, 29(6):989-996.
(Location: IWMI-HQ Call no: PER Record No: H014512)
(Location: IWMI-HQ Call no: P 4915 Record No: H022911)
(Location: IWMI-HQ Call no: P 4917 Record No: H022913)
(Location: IWMI-HQ Call no: PER Record No: H035007)
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