http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Department of the Interior. United States Geological Survey. Charles D. Walcott, Director. A review of the laws forbidding pollution of inland waters in the United States
Water-supply paper 103; Laws forbidding pollution of inland waters in U.S
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