00466nam a2200169Ia 4500001001000000003000500010008004100015010001100056040000900067100001500076245004500091260005500136300001000191440002600201650002900227650004000256Para_6438CHAP220125s1999    xx            000 0 und d  a205178  cCHAP  aHock, W.K.  aUsing pesticides safely /c by W.K. Hock  aPennsylvania :b The Pennsylvania State University  a12 p.  aSpecial circular; 296  aPesticidas x análisis  aPesticidas x medidas de seguridad