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Received for publication 22 May 1983. This work was supported, in part, by Arab Republic of Egypt-University of California-U.S. Agency for International Development Contract No. 263-0041, Agricultural Development Systems project. The authors gratefully acknowledge the assistance of M.F. Miller, Division of Statistics, Univ. of California, Davis, in providing statistical analyses and advice. 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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