00369nam a2200145Ia 4500008004100000082001600041100002500057245002000082250000600102260004700108300000800155650002300163650001800186653001900204170901s1957    xx            000 0 und d  a581.2bW13P  aWalker, John Charles 0aPlant Pathology  a2  aNew YorkbMcGraw-Hill Book Co., Inc.c1957  a707  aBotanical sciences  aPure Sciences  aPlant diseases