U.S. Geological Survey Fact Sheet 0072-00

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U.S. Department of the Interior - U.S. Geological Survey Biology || Geography || Geology || Water This page is <URL: http://pubs.usgs.gov/fs/fs-0072-00/> Last Modified Tue May 2 15:28 EDT 2000 Website Maintained by: Tracy Pinto USGS Accessibility Statement || USGS Privacy Statement || Disclaimer