Gray, J.E., Folger, P.F., and Hageman, P.L., 1997, Map showing the distribution of anomalous concentrations of mercury, antimony, and arsenic in stream sediment, heavy-mineral concentrate, and aquatic moss in the Iditarod Quadrangle, Alaska: U.S. Geological Survey Miscellaneous Field Studies Map 2219-C, 1 p., 1 sheet, scale 1:250,000.