Assistant Professor.
Professor.
Received for publication 16 Feb. 1984. Paper No. 9159 of the Journal Series of the N.C. Agr. Res. Serv., Raleigh. The authors gratefully acknowledge the suggestion on methodology provided by C. Clark Cockerham, and the technical assistance of R.R. Horton and L.D. Jackson. 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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