Received for publication June 14, 1982. Paper No. 8361 of the Journal Series of the North Carolina Agricultural Research Service, Raleigh. N.C. The use of trade names in this publication does not imply endorsement by the North Carolina Agricultural Research Service of products named, nor criticism of similar ones not mentioned.
This paper was prepared with the help of the Technical Committee of the Northeast Regional Marketing Project NE-103. I would especially like to thank Perry Lidster, E. C. Lougheed, L. M. Massey, Jr., and W. J. Bramlage for their helpful comments made during the writing of this paper.
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