These districts are:--
1. Great Plains district.
2. Columbia River district
3. Great Basin district.
4. Colorado River district.
5. California district.
_Great Plains district.--_On the eastern slope of the Rocky
Mountains, extending eastward to the extreme boundary of the
dry-farm territory, are the soils of the High Plains and the Great
Plains. This vast soil district belongs to the drainage basin of the
Missouri, and includes North and South Dakota, Nebraska, Kansas,
Oklahoma, and parts of Montana, Wyoming, Colorado, New Mexico,
Texas, and Minnesota. The soils of this district are usually of high
fertility. They have good lasting power, though the effect of the
higher rainfall is evident in their composition. Many of the
distinct types of the plains soils have been determined with
considerable care by Snyder and Lyon, and may be found described in
Bailey's "Cyclopedia of American Agriculture," Vol. I.
_Columbia River district.--_The second great soil district of the
dry-farming territory is located in the drainage basin of the
Columbia River, and includes Idaho and the eastern two thirds of
Washington and Oregon.
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