00374nam a22001337a 4500003000400000008004100004082001600045100001800061245006000079260004000139650001800179650002300197650002000220OSt230804b        |||||||| |||| 00| 0 eng d  a581.2bC32N  aChester, K.S.  aNature & Prevention of Plant Diseasescby K. S. Chester  a.- New Yorkb: Mc Grow Hillc, 1950  aPure Sciences  aBotanical Sciences  aPlant Pathology