00287nam a2200109Ia 4500008004100000082001500041100001900056245004100075260003900116300001000155650001200165140113s9999    xx            000 0 und d  a632.38  H7  a" Cook, M. T."  aViruses and virus diseases of plants  b"Burgess publishing company, 1947"  a244p.  aViruses