. . "Crops and climate." . . . . . . . . . . "Grain yields and the american food supply. An analysis of Yield changes and possibilities" . . . "Grain yields and the American food supply; an analysis of yield changes and possibilities" . . . . . . . "Grain yields and the American food supply : an analysis of yield changes and posibilities"@en . . . . . . . . . . "Grain yields and the American food supply : an analysis of yield changes and possiblites" . "Grain Yields and the American Food Supply : An Analysis of Yield Changes and Possibilities" . . . . . "Grain yields and the American food supply : an analysis of yield changes and possibilities" . . . "Grain yields and the American food supply" . . . "Céréales États-Unis." . . "Céréales Commerce États-Unis." . . "United States." . . "Grain United States." . . "Crop yields." . . "Grain." . .