00376nam a2200133Ia 4500008004100000082001300041100002500054245002800079260004900107300001300156490002600169600002400195650002300219140224s9999    xx            000 0 und d  a579.8 L0  aEhrenfield, David W.  aBiological conservation  aNew YorkbHolt, Reinhart and Winstoncc 1970  axi,226p.  aMadras Biology Series  aDavid W. Ehrenfield  aBiological control