Johnson, David Gale
Grain yields and the American food supply: an analysis of yield changes and possibilities / David Gale Johnson, Robert L. Gustafson - Chicago : Chicago University Press, 1962 - xii, 146p. : ill. ; 23 cm.
Includes bibliographical references and index.
Seeds
Crops and climate
Crop yield
Grain
633.101 Us / JOH
Grain yields and the American food supply: an analysis of yield changes and possibilities / David Gale Johnson, Robert L. Gustafson - Chicago : Chicago University Press, 1962 - xii, 146p. : ill. ; 23 cm.
Includes bibliographical references and index.
Seeds
Crops and climate
Crop yield
Grain
633.101 Us / JOH