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Received for publication March 1, 1973. Published as Paper No. 3561, Journal Series, Nebraska Agricultural Experiment Station. Conducted for the Nebraska Department of Roads by the Department of Horticulture and Forestry, University of Nebraska, in cooperation with the U. S. Department of Transportation, Bureau of Public Roads. The opinions, findings, and conclusions expressed in this report are those of the authors and not necessarily those of the Nebraska Department of Roads or Bureau of Public Roads.
Assistant Professor, Graduate Research Assistant, and Professor, Department of Horticulture and Forestry, University of Nebraska.
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