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Valles_caldera2 by USFS, Interior West FIA (Forest Inventory and Analysis). Used via Public Domain, via Flickr.
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(c) 2005 Derek and Julie Ramsey (Ram-Man). Incorporated here under the Creative Commons Attribution-Share Alike 2.5 Generic license. No endorsement by licensor implied.
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Photo attributed to U.S. Fish and Wildlife Service Headquarters. Incorporated here under the Creative Commons Attribution 2.0 Generic license. No endorsement by licensor implied.
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Photo attributed to Ansgar Walk. Incorporated here under the Creative Commons Attribution-Share Alike 3.0 Unported license. No endorsement by licensor implied.