| http://www.w3.org/ns/prov#value | - [1] See for example U.S. House of Representatives Committee on Energy and Commerce, Minority Staff, Chemicals Used in Hydraulic Fracturing (April 2011), identifying 750 chemicals used in hydraulic fracturing, including 29 chemicals that are known carcinogens, regulated under the Safe Drinking Water Act, or listed as Hazardous Air Pollutants; US General Accountability Office, Information on the Qua
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