The conterminous United States mineral-resource assessment program : background information to accompany folio of geologic and mineral-resource maps of the Rolla 1° x 2° quadrangle, Missouri / by Walden P. Pratt ; prepared in cooperation with the Missouri Department of Natural Resources, Division of Geology and Land Survey (U.S. Geological Survey circular ; 1068)
The conterminous United States mineral-resource assessment program : background information to accompany folio of geologic and mineral-resource maps of the Rolla 1° x 2° quadrangle, Missouri / by Walden P. Pratt ; prepared in cooperation with the Missouri Department of Natural Resources, Division of Geology and Land Survey