"Limited rainfall is the controlling factor in crop production in the Great Plains. The average yields of a series of years can be foretold from the records of

"Limited rainfall is the controlling factor in crop production in the Great Plains. The average yields of a series of years can be foretold from the records of

Excerpt from The Great Plains and the Supply of Wheat The Great Plains has no commonly accepted fixed boundary. In general the mountains on the west, the 20-inc