00474nam a22001817ar450000100040000000500170000400800410002104000120006204100080007404400140008208200210009610000360011724500520015326000380020530000180024344000180026165000130027916120260807120459.0930909s1982 ag 000 0 spa d aclsautm aspa aArgentina14a574.5bA543 19821 aAnder-Egg, Ezequiel,d1930-202413aEl desafío ecológico /cEzequiel Ander-Egg. aBuenos Aires :bHumanitas,c1982. a150 p.b: il. 0aGuidanee ; 16 0aECOLOGIA