00316nam a2200109Ia 4500008004100000082001800041100003300059245003600092260004800128300001000176650002000186140113s9999    xx            000 0 und d  a632.9(023) G7  a" Heald, Frederick Deforest"  aIntroduction to plant pathology  b"New York : McGraw-hill book company, 1937"  a579p.  aPlant pathology