00777cam a22002891 4500 agr50000488 DLC 20260227111013.0 750709s1950 xx 000 0 eng agr50000488 GB51-116 (OCoLC)1437280 DLC FM Uk DNAL DLC SB731 .W235 464 W15 F830 581.2 Walker, J. C. (John Charles), 1893- Plant pathology. 1st ed. New York, McGraw-Hill 1950 x. 699 p. illus. 24 cm. McGraw-Hill publications in the agricultural sciences Includes bibliographies. Plant diseases. Vegetable pathology. 11216 11216