ACKNOWLEDGEMENTS 



The authors wish to thank C. W. Crickman of the Farm 

 Production Economics Division, Economic Research Service, 

 U. S. Department of Agricuhure for his contribution to the 

 editorial quality of this publication. 



This work was done in part at the University of New Hamp- 

 shire Computation Center. 



8/68/1 M/OP9 26 



