00298nam a2200109Ia 4500008004100000082001800041100002500059245003900084260003700123300001000160650001800170140113s9999    xx            000 0 und d  a632.38(02) J7  a" Smith, Kenneth M."  aA textbook of plant virus diseases  b"London : J & A Churchill, 1957"  a652p.  aPlant viruses