00373pab a2200133 454500008004000000100002100040245005800061260000900119300001100128362000900139650002400148700002000172773004700192180718b1987   xxu||||| |||| 00| 0 eng d  aKopp, Raymond J.  aAgricultural policy and the benefits of Ozone control  c1987  a936-62  aDec,  aAgricultural Policy  aHan J. Krupnick  aAmerican Journal of Agricultural Economics