Because It's Not There: Climbers May Face Danger If Everest's Hillary Step Collapsed - Scientific American
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File:Mount Everest, Altitudes Of Various Discoveries, The Three Steps, And Its Summit.jpg - Wikipedia
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Timeline of Mount Everest expeditions - Wikipedia
EVEREST's Hillary Step: Has It Collapsed Or Not? - YouTube
Climbers say it's easier to climb Everest as Hillary Step collapses | Daily Mail Online
Everest's Hillary Step: Has it gone or not? - BBC News
Mount Everest's famous Hillary Step destroyed, mountaineers confirm - BBC News
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