1. Nickel distribution in B-horizon soils, Iron River 1° x 2° quadrangle, Michigan and Wisconsin [cartographic material] Yale Public content 1984. 2002-06-01T04:00:00Z. 2016-07-13T21:12:34Z. Geological Survey (U.S.). The Survey ; For sale by Branch of Distribution, USGS. English. cartographic image. Public. Michigan, Wisconsin, Michigan., and Wisconsin.