923 resultados para water pollution control


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"IEPA/WPC/89-212."--Cover.

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"IEPA/WPC/95-020"--Cover.

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"July, 1993."

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"October 1993."--Cover.

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"February 1988."--Cover.

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"IEPA/WPC/95-013."--Cover.

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Performing organization: Illinois Environmental Protection Agency, Bureau of Water, Division of Water Pollution Control.

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"IEPA/WPC/89-105."--Cover.

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Survey made cooperatively by the Illinois Environmental Protection Agency and the Illinois Dept. of Conservation.

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"IEPA/WPC/92-053."--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.