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The map services, software, and related documentation on these web pages were developed by the U.S. Geological Survey (USGS) for use by USGS in fulfilling its mission. The map services contain small scale data (1:1,000,000-scale and smaller) which is best displayed at a national or regional level.

The USGS provides no warranty, expressed or implied, as to the correctness or suitability of the map services for any purpose. No responsibility is assumed by the USGS in the use of these map services.

Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government.