Grain yields and the American food supply
Subtitle: an analysis of yield changes and possibilities
By: [by] D. Gale Johnson and Robert L. Gustafson.  With introductions by Paul B. Sears.
Contributors: Gustafson, Robert L., joint author.
Publisher: University of Chicago Press
Published: 1962
Place of publication: [Chicago]
Language: eng
Number of pages: 146
Subjects: Grain -- United States.; Crop yields.; Crops and climate.