New EPA regulations sharply curb emissions from new Cu, Pb, Zn smelters. IN: Engineering and Mining Journal (E&MJ) ; v. 177, n. 3, 1976, p. 37.
New EPA SO2 regulations for Arizona smelters mollify the industry but threaten Douglas. IN: Engineering and Mining Journal (E&MJ) ; v. 177, n. 1, 1976, p. 31 & 37.
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Updated 22 April 2013