U.S. Geological Survey - Missouri Geological Survey Symposium: Mineral-resource potential of the Midcontinent : program and abstracts, St. Louis, Missouri, April 11-12, 1989 /

[Denver, CO] : U.S. Geological Survey, 1989

U.S. Geological Survey-Missouri Geological Survey symposium : mineral-resource potential of the mid-continent : program and abstracts : St. Louis, Missouri, April 11-12, 1989 /

Washington : Denver, CO : Dept. of the Interior, U.S. Geological Survey : U.S. G.P.O. ; Free application to the Books and Open-File Reports Section, U.S. Geological Survey, 1990