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W. F. McClure
North Carolina State University, Department of Biological and Agricultural Engineering, Raleigh, North Carolina, U.S.A.
K. H. Norris
United States Department of Agriculture, Agricultural Research Service, Agricultural Research Center, Agricultural Marketing Research Institute, Instrumentation Research Laboratory, Beltsville, Maryland, U.S.A.
W. W. Weeks
North Carolina State University, Department of Crop Science, Raleigh, North Carolina, U.S.A.