EPA (U.S. Environmental Protection Agency), 1999, "List of Substances on IRIS,"http://www.epa.gov/iris/subst/index.html, Boron/0410.htm, Cadmium/0141.htm, Chromium III/0028.htm, Chromium IV/0144.htm. Manganese/0373.htm, Molybdenum/0425.htm, Nickel/0271.htm. Uranium/0421.htm. Vanadium/0125.htm, Zinc/0426.htm. June 10, Office of Research and Development, National Center for Environmental Assessment, Cincinnati, Ohio, 1999

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