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Anhydrous ammonia--, its use?
(North Dakota State University, 1979)
Soil sampling for fertilizer recommendations
(North Dakota State University, 1990)
Soil Test For Profit
(North Dakota State University, 1976)
Soil Sampling as a Basis for Fertilizer Application
(North Dakota State University, 1998)
Effectiveness of Gypsum in the North-central Region of the U.S.
(North Dakota State University, 2006)