446 resultados para Illinois. Division of Soil and Water Conservation


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"December, 1994."

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"IEPA/WPC/90-171."--Cover.

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"Printed by Division of Water Resources, Illinois Dept. of Transportation, and Illinois Environmental Protection Agency." -- Cover.

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"IEPA/WPC/88-030."--Cover.

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"July, 1993."

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"October 1993."--Cover.

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"The Illinois Environmental Protection Agency monitors surface waters (i.e. lakes and streams) through a variety of programs. The most extensive is the Ambient Water Quality Monitoring Network (AWQMN) which consists of 203 stream stations statewide sampled on a 6 week cycle since October 1977." -- p. 1.

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"IEPA/WPC/88-009."

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"IEPA/WPC/93-192."--Cover.