Preliminary geologic map of the Spring Valley 30' x 60' quadrangle, Missouri [microform] / U.S. Department of the Interior, U.S. Geological Survey ; by Randall C. Orndorff and Richard W. Harrison (Open-file report ; 97-434)
Preliminary geologic map of the Spring Valley 30' x 60' quadrangle, Missouri [microform] / U.S. Department of the Interior, U.S. Geological Survey ; by Randall C. Orndorff and Richard W. Harrison