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	1.	The effects on production and profits of different forms of pollution control standards by Helfand, G.E Series: University of California Working Paper Series ; No. 467 Material type: Text Language: En Publication details: Berkeley, CA (USA) : University of California. Department of Agricultural and Resource Economics, 1988 Availability: Items available for loan: CIMMYT Knowledge Center: John Woolston Library (1)Call number: Look under series title. Place hold Log in to add tags Add to cart (remove)
	2.	Mathematical appendices for: Reconciling the Von Liebig and differentiable crop production functions by Berck, P Helfand, G.E [coaut.] Series: University of California Working Paper Series ; No. 455a Material type: Text Language: En Publication details: Berkeley, CA (USA) : University of California. Department of Agricultural and Resource Economics, 1990 Availability: Items available for loan: CIMMYT Knowledge Center: John Woolston Library (1)Call number: Look under series title. Place hold Log in to add tags Add to cart (remove)
	3.	Standards versus Standards : the effects of different pollution restrictions by Helfand, G.E Material type: Article Language: English Publication details: USA : American Economic Association, 1991 In: American Economic Review v. 281, n. 1, p. 622-634 Availability: Items available for loan: CIMMYT Knowledge Center: John Woolston Library (1). Place hold Log in to add tags Add to cart (remove)

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