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Hla, S.S.; Helms, T.C. (North Dakota State University, 1991)

Herman, Dale E.; Drugan, Barbara; Boe, A.A. (North Dakota State University, 1991)

Koo, Won W. (North Dakota State University, 1991)

Drugan, Barbara; Boe, A.A. (North Dakota State University, 1991)

Herman, Dale E.; Drugan, Barbara; Coe, A.A. (North Dakota State University, 1991)

Cihacek, L.J.; Gonzales, P.B. (North Dakota State University, 1991)

Leistritz, F. Larry (North Dakota State University, 1991)

Wilson, William W.; Nelson, William C.; Dunca, Marvin (1991)

Unknown author (1991)