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Stanford University. Palo Alto, California, "Wheat Studies of the Food Research Institute," March. 193 7
SCALE .7
Distribution of 209 World Wheat Areas According to Annual and Pre-Harvest Precipitation and Tennperature.
I. The most strikinR feature of this chart is the concentration of "high" and "superior" yields of wheat within the middle ranges of annual and pre-harvest precipitation and of annual temperature.
1. Of the 60 areas characterized by an annual precipitation of less than 20 inches, only 18 had long-time average yields of wheat above 14 bushels. These 18 are dryfarming areas in Canada and the western United States.
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FOUR SMALL CITIES IN OREGON AND WASHINGTON
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