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Cover: Alluvial mine tailings deposits along the Arkansas River in Leadville, CO. Salt concentrations on the surface of the tailings contain up to 9% zinc. See Brown et al. "Ecosystem Function in Alluvial Tailings after Biosolids and Lime Addition," p. 139-148. Photo by Chuck Henry. This paper is part of the special submissions section in this issue that starts on p. 7.