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Photo of a geyser in Yellowstone national park (USA), used in geyser sign.
Author: Hans Jørn Storgaard Andersen
Original file: https://commons.wikimedia.org/wiki/File:Ynp-old-faithful.jpg
Modifications: cropped into a square format
License: This file is licensed under the Creative Commons Attribution ShareAlike 2.5 License. In short: you are free to share and make derivative works of the file under the conditions that you appropriately attribute it, and that you distribute it only under a license identical to this one.