Received for publication 30 Oct. 1985. We acknowledge the valued assistance of G. A. Brown, Biological Laboratory Technician. Use of a company or product name by the USD A does not imply approval or recommendation of the product to the exclusion of others which may also be suitable. 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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