00355nam a2200121Ia 450000500170000000800410001702000160005805000170007410000170009124500730010826000340018165000180021520251229192539.0251229s9999    xx            000 0 und d  a01233386500  aSB 731 .H34   aHelgeson J P 0aUse of Tissue Culture and Protoplasts in Plant PathologycP Helgeson  aLondonb Academic pressc1983  aPlant Disease