00260nas a2200121Ia 4500001001000000008004100010041001300051044000700064245002000071260001600091362000600107866002500113Perio-181210501s9999    xx            000 0 und d  aInglés  aUS 0aWRI enviro ling  aLos Angeles  a-  a1998 : Vol. 7, n° 2