00267nam a2200097Ia 4500080002400000100002100024245007000045260002500115300001000140583001900150  a02.01.01 C748(1987)  aRivera, Pedro J.  aCBI and the twin plant scheme : are they development alternatives  b[s.n.]a[S.l.]c1987  a19 p.  c3/7/00kM2LMGR