CONTENTS 



Page 



Geographical Area 1 



Review of United States Soil- Management Problems 1 



General 1 



North Dakota 4 



South Dakota 11 



Montana 15 



Wyoming 18 



Nebraska 18 



Kansas 33 



Colorado 46 



Carbon and Nitrogen Changes in Soils at 10 Dryland Experiment Stations 47 



Canadian Prairie Provinces Soil- Management Problems 52 



Summary and Conclusions 58 



Literature Cited 60 



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