00640cam a22002171  45000010008000000030008000080050017000160080041000330100017000740400027000910500022001180820015001401000042001552450044001972600036002413000033002773650014003104900058003245000020003826500020004023594224BD-DhUL20141219130752.0681212s1950    nyua     b    001 0 eng    a   68022770   aDLCcDLCdDLCdBD-DhUL00aSB731b.W235 196900a581.2bWAP1 aWalker, J. C.q(John Charles),d1893-10aPlant pathology /cJohn Charles Walker.  aNew York :bMcGraw-Hill,c1950.  aix, 699 p. :bill. ;c22 cm.  aGBPb3.45 0aMcGraw-Hill publications in the agricultural sciences  aIncludes index. 0aPlant diseases.