The Institute is funded in part by the Geological Survey, U.S. Department of the Interior, as authorized by the Water Resources Research Act of 1984.
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A self-index, updated after each issue, is available. Since the time many of these articles were first published, area codes have changed. In addition, many other new area codes have been created. If you suspect that an area code listed on these web pages is no longer correct, please visit the web site of the Texas Public Utilities Commission to view the latest area code information.