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Hutchinson, T.C.; Whitby, L.M. (1974). "Heavy-metal pollution in the Sudbury mining and smelting region of Canada, I. Soil and vegetation contamination by nickel, copper, and other metals". Environmental Conservation. 1 (2): 123–13 2. Bibcode:1974EnvCo...1..123H. doi:10.1017/S0376892900004240. ISSN1469-4387. S2CID86686979.
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Hutchinson, T.C.; Whitby, L.M. (1974). "Heavy-metal pollution in the Sudbury mining and smelting region of Canada, I. Soil and vegetation contamination by nickel, copper, and other metals". Environmental Conservation. 1 (2): 123–13 2. Bibcode:1974EnvCo...1..123H. doi:10.1017/S0376892900004240. ISSN1469-4387. S2CID86686979.
Sjöstrand, Torgny (12 January 1947). "Changes in the Respiratory Organs of Workmen at an Ore Smelting Works1". Acta Medica Scandinavica. 128 (S196): 687–699. doi:10.1111/j.0954-6820.1947.tb14704.x. ISSN0954-6820.