Wetlands of the United States
Their Extent and Their Value To Waterfowl and Other Wildlife
Figure 1
| Figure 1. -- Agricultural land (acreage as of Jan. 1, 1950) in drainage enterprises. |
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| Figure 1. -- Agricultural land (acreage as of Jan. 1, 1950) in drainage enterprises. |
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U.S. Department of the Interior | U.S. Geological Survey
URL: http://www.npwrc.usgs.gov/resource/wetlands/uswetlan/fig1.htm
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Page Last Modified: August 3, 2006