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Arrowhead.jpg (17 kB, định dạng MIME: image/jpeg)


Uploaded from : http://upload.wikimedia.org/wikipedia/en/5/54/Arrowhead.jpg Obsidian arrowhead.

Source: http://www.ornl.gov/info/news/pulse/pulse_v44_99.htm


Public domain This image is a work of a United States Department of Energy (or predecessor organization) employee, taken or made during the course of an employee's official duties. As a work of the U.S. federal government, the image is in the public domain.

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