Walker, J. C. 1893-
Plant pathology / John Charles Walker. - New York : McGraw-Hill, 1950. - ix, 699 p. : ill. ; 22 cm. - McGraw-Hill publications in the agricultural sciences .
Includes index.
68022770
Plant diseases.
SB731 / .W235 1969
581.2 / WAP
Plant pathology / John Charles Walker. - New York : McGraw-Hill, 1950. - ix, 699 p. : ill. ; 22 cm. - McGraw-Hill publications in the agricultural sciences .
Includes index.
68022770
Plant diseases.
SB731 / .W235 1969
581.2 / WAP