![](https://www.pdfsearch.io/img/2d4d6a5d4eb86342d2c0f511c4aa9701.jpg) Date: 2012-01-14 06:08:00
| | Grand Canyon National Park Service U.S. Department of the Interior Grand Canyon National Park Division of Science and ResourceAdd to Reading ListSource URL: www.gcrg.orgDownload Document from Source Website File Size: 2,26 MBShare Document on Facebook
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