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Most materials published on the Earth
Observatory, including images, are freely
available for re-publication or re-use,
including commercial purposes, except for
where copyright is indicated. In those cases
you must obtain the copyright holder’s
permission; we usually provide links to the
organization that holds the copyright.
We ask that NASA’s Earth Observatory
be given credit for its original materials;
the only mandatory credit is NASA.
For more information about using NASA
imagery visit http://www.nasa.gov/audience/formedia/features/MP_Photo_Guidelines.html.