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By "Black & Veatch."
Assessment of the toxicity of arsenic, cadmium, lead and zinc in soil, plants, and livestock in the Helena Valley for East Helena site (ASARCO), East Helena, Montana.
By: Asarco Inc. - Black & Veatch. - CH2M Hill, inc. - United States.
Publication info: Mont.? :U.S. EPA?,1987
Contributed by: Montana State Library (archive.org)