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Contributor Notes
Received for publication October 13, 1972. Prepared as part of an investigation conducted by Joint Highway Research Project, Engineering Experiment Station, Purdue University, in cooperation with the Indiana State Highway Commission and the U. S. Department of Transportation Federal Highway Administration. The opinions, findings and conclusions expressed in this publication are those of the author and not necessarily those of the Federal Highway Administration.
The author thanks H. L. Flint for his assistance.
Journal Paper No. 4880. Purdue University, Agricultural Experiment Station, Lafayette.
Department of Horticulture.
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