Introduction to plant pathology / Frederick DeForest Heald. Heald, F. D. (Frederick DeForest), 1872- Plant diseases. SB731 .H38 1943 581.2 HEI Includes bibliographical references and index. New York : McGraw-Hill, 1943. 1943. 1943 Text xii, 603 p. : eng McGraw-Hill publications in the agricultural sciences