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Figure 24.6--Present mean annual precipitation for the United States (top). Mean annual precipitation in inches at 18,000 yr BP is shown below. For most of the 2 million years of the ice age the mean annual precipitation was significantly less than today (modified U.S. Department of Agriculture 1941).

Map of continental U.S. plus detail of the South with lines showing highest rainfall of 40 inches in Southern Appalachians, and most of the South receiving 20 to 27.

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content: Wayne D. Carroll
webmaster: John M. Pye

created: 4-OCT-2002
modified: 08-Dec-2013