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Scientific Paper no. 7596. College of Agriculture and Home Economics, Washington State Univ., Pullman; Project no. 0321. I am indebted to all the former and current members of this laboratory who have contributed to this investigation. This work was supported by the National Science Foundation Grant DCB-8502215 and the National Aeronatuics and Space Administration Grant NAG-10-0032. The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
Professor, Dept. of Horticulture and Landscape Architecture.
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