@article {71,
	title = {National Recommended Water Quality Criteria},
	journal = {Federal Register},
	volume = {63},
	year = {1998},
	pages = {68354-68364},
	author = {US EPA}
}
@article {1926,
	title = {Ambient Water Quality Criteria for copper},
	number = {84},
	year = {1984},
	institution = {Environmental Protection Agency},
	address = {Washington, DC},
	author = {US EPA}
}
@article {1840,
	title = {In depth studies on the health and environmental impacts of selected water pollutants},
	year = {1978},
	institution = {United States Environment Protection Agency},
	author = {US EPA}
}
