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1. Climate, Land Use, and Environmental Sensitivity (CLUES) [USGS_CLUES]
Vegetation changes caused by climatic variations and/or land use may have large impacts on forests, agriculture, rangelands, natural ecosystems, and endangered species. Climate modeling studies indicate ...

2. USGS Geologic Map of North America [USGS_GMNA]
The Geologic Map of North America (published February 2005) portrays the grand architecture of the continent as we understood it in the closing years of the 20th century. As the final ...

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