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Received for publication 2 Mar. 1987. Mention of a trade name is solely for the purpose of providing specific information and does not constitute a guarantee or warranty of the product by the USDA or an endorsement by the department over other products not mentioned. We gratefully acknowledge Marla McIntosh, Statistical Consulting Group, ARS/USDA, Beltsville, for assistance with the data analysis. 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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