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1. USGS Geographic Names Information System: United States and Territories Online Database [GNIS]
The U.S. Board on Geographic Names is a Federal body created in 1890 and established in its present form by Public Law in 1947 to maintain uniform geographic name usage throughout the Federal Government. ...

2. Seismic Hazards of the US [Seismic_Hazard_USGS]
The hazard maps depict probabilistic ground motions and spectral response with 10%, 5%, and 2% probabilities of exceedance (PE) in 50 years. These maps correspond to return times of approximately ...

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USA dot gov - The U.S. Government's Official Web Portal NASA
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Last Updated:  April 2014