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Caldera
By Heath Stallcup
238 5-star reviews! For years, the biggest threat that Yellowstone was thought to offer was in the form of its semi-dormant super volcano. But lying deep within the bowels of the earth itself, an ancient virus waited. Recently credited with the extinction of Neanderthal man, the virus erupts into a crowded Yellowstone. Now Park Rangers and local Sheriff's find themselves overwhelmed with a park full of infected human cannibals…
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