Crop production
Hughes, Harold De Mott.
Metcalfe, Darrel Seymour.
Johnson, Iver J.
New York Macmillan London Collier-Macmillan
1972
Previous ed., by Harold D. Hughes, Darrel S. Metcalfe, Iver J. Johnson. New York; [London]: Macmillan, 1957
Includes bibliographies and index
Field crops.