This is a file from the Wikimedia Commons. The description on its description page there is shown below. Commons is a freely licensed media file repository. You can help.
See in Valuing Water.
http://creativecommons.org/licenses/by-sa/3.0 CC-BY-SA-3.0 Creative Commons Attribution-Share Alike 3.0 truetrue
Please help improve this media file by adding it to one or more categories, so it may be associated with related media files (how?), and so that it can be more easily found.
Please notify the uploader with
Click on a date/time to view the file as it appeared at that time.
The following 2 pages link to this file: