Received for publication 18 Feb. 1986. I thank K. Maybury, Department of Agricultural Economics, Univ. of Illinois, for providing introductory training on Lotus 1-2-3, and J. Smith, UI Horticulturist, for consultation on the campus inventory records. Departmental microcomputers were provided through the Chancellor's office (instructional equipment grant) and the Agricultural Experiment Station Project no. 65-363. 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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