File:The quality of the surface waters of Illinois (IA qualityofsurface00coll).pdf
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![File:The quality of the surface waters of Illinois (IA qualityofsurface00coll).pdf](https://upload.wikimedia.org/wikipedia/commons/thumb/1/10/The_quality_of_the_surface_waters_of_Illinois_%28IA_qualityofsurface00coll%29.pdf/page1-356px-The_quality_of_the_surface_waters_of_Illinois_%28IA_qualityofsurface00coll%29.pdf.jpg?20200825061119)
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