Image Sources

US Geological Survey websites…

http://pubs.usgs.gov
http://earthshots.usgs.gov
http://www.usgs.gov/newsroom/photos.asp

Unless stated otherwise, photos and videos may be regarded as public domain, but credit must be given:
Credit: U.S. Geological Survey
Department of the Interior/USGS
U.S. Geological Survey/photo by Jane Doe (if the photographer/artist is known)

http://www.usgs.gov/laws/info_policies.html

NASA websites:

http://www-airs.jpl.nasa.gov
http://www.giss.nasa.gov
http://earthobservatory.nasa.gov/Observatory/
http://modis.gsfc.nasa.gov
http://modis-snow-ice.gsfc.nasa.gov
http://visibleearth.nasa.gov/view_set.php?categoryID=1351

NASA Goddard Scientific Visualization Studio (videos)
http://svs.gsfc.nasa.gov

NASA - Climate Change Resource Reel (videos)
http://www.nasa.gov/centers/goddard/earthandsun/climate_change.html

National Snow and Ice Data Center
http://nsidc.org/sotc/index.html
http://nsidc.org/data/citations.html

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