Image:North america terrain 2003 time scale.jpg
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| This is a file from the Wikimedia Commons. The description on its description page there is shown below. |
This is the time scale for the North America Tapestry of Time and Terrain map.
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[edit] Source
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This image is in the public domain because it contains materials that originally came from the United States Geological Survey, an agency of the United States Department of Interior. For more information, see the official USGS copyright policy |
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Home: http://pubs.usgs.gov/imap/i2781/
Image: http://pubs.usgs.gov/imap/i2781/i2781_c_low.pdf 144 dpi, encoded to 72 dpi JPEG, compressed slightly to fit within Wikipedia 2MB limit.
English Wikipedia, original upload 15 April 2005 by SEWilco
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