TY - RPRT TI - Spectrographic and chemical analyses of exposed Precambrian rocks, Rolla 1° x 2° quadrangle, Missouri AU - Walden P. Pratt AU - S. K. Odland AU - A.E. Hubert AU - D. F. Siems AU - J.G. Viets PY - 1980 DO - 10.3133/ofr8025 UR - https://pubs.usgs.gov/publication/ofr8025 ID - ofr8025 ER -