00650nam a2200193Ia 4500001001000000003000500010008004100015010001100056040000900067082002100076111010100097245010300198260003000301300001100331650002900342650004000371650002800411700001700439Para_6634CHAP220125s1981    xx            000 0 und d  a205454  cCHAP  aPA 632.95042 I58  aInternational symposium on controlled release of Bioactive Materials (7: 1980: Lauderdale, Fla.)  aControlled release of pesticides and pharmaceuticals :b Proceedings  /c Edited by Danny H. Lewis  aNew York :b Plenum Press  a340 p.  aPesticidas x congresos   aPesticidas x medidas de seguridad   aPesticidas x toxicidad  aLewis, Danny