00373naa a2200133 a 450000100080000000500110000800800410001910000220006024500620008226000090014465300090015365300100016277300670017210930551997-07-14       1965    bl ---       0--  u    #d1 aENGELBRECHT, D.J.  aGraft-transmission of pear mosaic and stony pit diseases.  c1965  aPERA  aVIRUS  tSouth African Journal of Agricultural Sciencegv.8, p.599-602.