Search Results       Your search for [subject]Gustafson, Robert L returned 1 record.           Grain yields and the American food supply ; an analysis of yield changes and possibilities. by Johnson, David Gale, 1916-; [Chicago]: University of Chicago Press, 1962. Subject: Gustafson, Robert L; Grain -- United States; Crop yields; Crops and climate.          Add to Book Cart Relevance: 18.25%