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File:Tree rings dating to the mid-1500s from a ponderosa pine log.jpg

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English: Tree rings dating to the mid-1500s from a ponderosa pine log collected near Taos, NM.
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Source United States Geological Survey
Author Ellis Margolis, USGS. Public domain.

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Public domain
This image is in the public domain in the United States because it only contains materials that originally came from the United States Geological Survey, an agency of the United States Department of the Interior. For more information, see the official USGS copyright policy.

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current16:45, 6 February 2017Thumbnail for version as of 16:45, 6 February 20172,557 × 461 (268 KB)MartinB29 (talk | contribs)User created page with UploadWizard

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