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31. Research material, soil conservation: "Soils - Land Capacity Classification", May 19, 1958 "Location of "Low Grade" Croplands in the Great Plains States", Andrew R. Aandahl, 1958 "Nature of Movement of Soil By Action of Wind in Wind Erosion", J. H. Stallings "Soil Erosion Survey of Oklahoma", 1929 "1937 Soil Building Practices List is Issued for State" "New Maps of Soils to be Issued Soon by State Survey", 1937 32. Research material, Central Great Plains: "Land Classification of the Central Great Plains, Part 2", J.G. Peterson, R. E. Morgan "Effects of Historical Droughts on Grassland Vegetation in the Central Great Plains", G. W. Tomanek and G. K Hulett "The Great Plains From Dust to Dust", Deborah Epstein Popper and Frank J. Popper, December 1987 33. Research material, Central Great Plains: "Land Classification of the Central Great Plains, Parts 4 and 5", Depue Falck 34. Research material, Northern Great Plains: "The Significance of Grassland Ecology to the Northern Great Plains", B. W. Allred, June 26, 1941 35. Research material, Northern Great Plains: "Post-War Program for Conservation and Improvement of Range and Native Pasture Lands in the Northern Great Plains", June 1, 1944 36. Research material, Northern Great Plains: "Managing Northern Great Plains Cattle Ranges to Minimize Effects of Drought", Leon C. Hurtt, March 1951 "Land Classification of the Northern Great Plains", A. E. Aldous and J. f. Deeds, 1929 37. Research material, University of Oklahoma:
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