1. Mineral-resource appraisal of the Rolla 1⁰ X 2⁰ quadrangle, Missouri, as of September 1980 : a nontechnical summary Author/Creator: Pratt, Walden P. Publication/Creation: [Reston, Va.?] : U.S. Dept. of the Interior, Geological Survey, 1983 Resource Type: Book Access & Availability: Loading