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| | United States. The Columbia Encyclopedia, Sixth Edition. 2001 |
 | | Agriculturally, the United States is first in the production of cheese, corn, soybeans, and tobacco. |
 | | The conterminous United States may be divided into seven broad physiographic divisions: from east to west, the AtlanticGulf Coastal Plain; the Appalachian Highlands; the Interior Plains; the Interior Highlands; the Rocky Mountain System; the Intermontane Region; and the Pacific Mountain System. |
 | | The United States is also one of the largest producers of cattle, hogs, cows milk, butter, cotton, oats, wheat, barley, and sugar; it is the worlds leading exporter of wheat and corn and ranks third in rice exports. |
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