Books by Robert V. Ruhe:
Books in the extended shelves:
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Ruhe, Robert V., 1918-: Landscape evolution and soil formation in southwestern Iowa (U.S. Dept. of Agriculture, 1967), also by John G. Cady, R. B. Daniels, and United States. Soil Conservation Service (page images at HathiTrust)- Ruhe, Robert V., 1918-: Missouri river history, floodplain construction, and soil formation in southwestern Iowa (Iowa Agriculture and Home Economics Experiment Station, Iowa State University of Science and Technology, 1975), also by Thomas E. Fenton and L. L. Ledesma (page images at HathiTrust)
Find more by Robert V. Ruhe at your library, or elsewhere.