"Yellowstone geysers" nps.gov Retrieved on 2008 - 03-20 ^ Mehta, Aalok (2008-04-16). "Photo in the News: Russia's Valley of the Geysers Lost in Landslide" . National Geographic . http://news.nationalgeographic.com/news/2007/06/070605-geyser-valley.html . Retrieved on 2007-06-07. ^ Harding, Luke (2007-06-05). "Mudslide fully changes terrain in Kamchatka’s Valley of Geysers" . Guardian Unlimited . http://www.guardian.co.uk/russia/article/0,,2095579,00.html .