1. Brothers seriously injured after bear attack in Yellowstone National Park  Jackson Hole News&Guide
  2. Two hikers injured in US bear attack on Yellowstone trail  The Guardian
  3. Hikers injured by bear in Yellowstone National Park  National Park Service (.gov)
  4. ‘Help Me, Help Me’: Hiker Finds Yellowstone Grizzly Attack Victim, Calls 911  Cowboy State Daily
  5. Local Lookout: Yellowstone reports first bear attack | Early birds flock to East Gate | Exhibit explores Battle of the Greasy Grass  WyoFile