Plant pathology /
Walker, John Charles,
Plant pathology / by John Charles Walker. - 3rd ed - New York : McGraw-Hill, 1969. - xi, 819 pages : illustrations ; 24 cm. - McGraw-Hill publications in the agricultural sciences .
007067860X
Fieldcrops--Diseases and pests.
Plant pathology / by John Charles Walker. - 3rd ed - New York : McGraw-Hill, 1969. - xi, 819 pages : illustrations ; 24 cm. - McGraw-Hill publications in the agricultural sciences .
007067860X
Fieldcrops--Diseases and pests.
