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Resolution: 1/2 - Click the region of interest for enlargement.
Image rights
Pre-Columbian stone sphere, Harvard University, Cambridge, Massachusetts, USA. Hochgeladen von Daderot. May 25, 2008. This file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported, 2.5 Generic, 2.0 Generic and 1.0 Generic license.