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Item A Five-Year Study of Fertilization of Extremely Grazed and Moderately Grazed Mixed-Grass Prairie with Slow-Release Phosphorus and Urea(North Dakota State University) Volk, J. M.; Barker, William T.; Nyren, P.Study showing the response of extremely and moderately grazed mixed-grass prairie vegetation to annual applications of slow release phosphorus and slow release urea.Item Grazing Systems for the Mixed Grass Prairie of North Dakota.(North Dakota State University) Kirby, Don; Barker, William T.; Nyren, PaulResults of a comparison study of three different grazing systems: season long, rotational and short term grazing.