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Received for publication 23 Jan. 1984. Scientific Paper No. 6951. College of Agr. and Home Economics, Washington State Univ., Pullman. Project No. 0321. This work was supported by National Science Foundation Grant PCM-8208408. We are thankful to Hari Krishnan and Mark Zimmerman for their technical assistance. 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.
Abstract
