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	1.	U.S. Geological Survey perspective on water-quality monitoring and assessment. [electronic resource] by Hirsch, Robert M Hamilton, Pixie A Miller, Timothy L Producer: 20060825 In: Journal of environmental monitoring : JEM vol. 8 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	The increasing need for science to inform policy--more than 30 years passage Clean Water Act. [electronic resource] by Hirsch, Robert M Hamilton, Pixie A Miller, Timothy L Producer: 20070117 In: Water environment research : a research publication of the Water Environment Federation vol. 78 Availability: No items available. Save to lists Add to cart (remove)

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