54 resultados para survey data


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"April 1968."

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"September 1967."

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"August 1966."

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Includes indexes.

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Cover title.

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"IEPA/BOW/00-001"--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.