This map is based on the 1980 publication "Thermal Springs List for the United States", from the NOAA's National Geophysical Data Center, which lists 1661 hot springs in the United States. The database is also available online, and via a non-Google map interface that actually has some nifty features.
Soak.Net
Hot Springs Enthusiast
Yahoo's hot springs page
Map courtesy of the Google Maps API.
Other Google Maps apps: Paris Star Forts, Transpac 2005 Tracks, BART Map/Schedule, Paris Metro Map, Google Planimeter.
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