Talk:The Exploration of the Colorado River and Its Canyons

External links modified (January 2018)
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I have just modified one external link on The Exploration of the Colorado River and Its Canyons. Please take a moment to review my edit. If you have any questions, or need the bot to ignore the links, or the page altogether, please visit this simple FaQ for additional information. I made the following changes:
 * Added archive https://web.archive.org/web/20111017091927/http://www.nationalgeographic.com/adventure/0404/adventure_books.html to http://www.nationalgeographic.com/adventure/0404/adventure_books.html

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Cheers.— InternetArchiveBot  (Report bug) 21:21, 29 January 2018 (UTC)