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Reaching your limits.

• Source: Science Activities. Winter95, Vol. 31 Issue 4, p40. 3p. 1 Diagram.

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Big Apple sours over purity of water.

• Authors : Scherer, Ron

• Source: Christian Science Monitor. 4/6/95, Vol. 87 Issue 91, p4. 1 Color Photograph.

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Drainage and Water Quality in Northern United States and Eastern Canada.

• Authors : Ritter, W. F.; Rudra, R. P.; Milburn, P. H.

• Source: Journal of Irrigation & Drainage Engineering. Jul/Aug95, Vol. 121 Issue 4, p296. 6p.

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