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Helgeson, Delmer L.; Schaffner, Leroy W. (North Dakota State University, 1982)

Swenson, Andrew L.; Johnson, Roger G. (North Dakota State University, 1982)

Johnson, Jerome E. (North Dakota State University, 1982)

Fay, P. K.; Nalewaja, J. D.; Miller, S. D.; Somody, C. N. (North Dakota State University, 1982)

Kopp, D. D.; Meyer, H.J.; Martin, R. J. (North Dakota State University, 1982)

Unknown author (1982)

Johnson, Jerome E. (North Dakota State University, 1982)

Unknown author (1982)