00291nam a2200109Ia 4500008004100000082001500041100002500056245001900081260004200100300001000142650002900152140113s9999    xx            000 0 und d  a632.38  M1  a" Mathews, R. E. F."  aPlant virology  b"New York : Academic Press Inc, 1981"  a897p.  aVirus diseases of plants