00519    a2200169   4500020001500000082001800015100002800033245004500061250001200106260004500118300001900163650003100182650006000213650002300273650002600296700002700322  a0632029730  a631.5233bSIL  aSilvertown, Jonathan W.  aIntroduction to plant population biology  a3rd ed.  aOxfordbBlackwell Scientificc1993g1993  axi,210p.c25cm  aCultivation and harvesting  aProduction of propagational organisms and new varieties  aPlant introduction  aAgricultural genetics  aDoust, Jonathan Lovett