00349nam a2200133Ia 4500008004100000082002200041100002000063245004700083260000900130300001000139600002400149600002400173650001800197140113s9999    xx            000 0 und d  a632.001.5(026) G6  a" Riker, A. J."  aIntroduction to research on plant diseases  b1936  a117p.  a" Riker, Regina S."  a" Riker, Regina S."  aPlant disease