982 resultados para Drainage ditch


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"PB 151694."

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Contiene: v. 1 - v. 2.

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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/93-192."--Cover.

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Cover title: Surface drainage program, background survey.

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