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<br />I <br /> <br />I <br /> <br />Introduction <br /> <br />I <br /> <br />u.s. Geological Survey <br />Charles Demas <br />Herman Feltz <br />Steven Hamilton <br />Stephen B. Smith <br />Doyle Stephens <br /> <br />I <br /> <br />I <br /> <br />References Cited <br /> <br />I <br /> <br />Heinz, G.H. and O.J. Hoffman. 1996. Combined <br />effects of mercury and selenium on mallard <br />reproduction. In: Abstracts for 17th Annual <br />Meeting, Society for Environmental Toxicology and <br />Chemistry, Washington, DC, November 17-21, <br />1996. p. 58. <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />I <br /> <br />Sprague, J.B. 1985. Factors that modify toxicity. <br />Chapter 6 of: G.M. Rand and S.R. Petrocelli, eds. <br />Fundamentals of aquatic toxicology-Methods and <br />applications. Hemisphere Publishing Corp., <br />Washington. p.124-163. <br /> <br />o <br />