Received for publication 23 June 1988. I acknowledge the help of D.W. Ramming (USDA, Fresno, Calif.), W.R. Okie (USDA, Byron, Ga.), and R. Scorza (USDA, Kearneysville, W. Va.) for their criticism during the development of this manuscript. 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.
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