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Ashfall (edition 2011)
by Mike Mullin
Ashfall by Mike Mullin
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After the eruption of the Yellowstone supervolcano destroys his city and its surroundings, fifteen-year-old Alex must journey from Cedar Falls, Iowa, to Illinois to find his parents and sister, trying to survive in a transformed landscape and a new society in which all the old rules of living have vanished.
(summary from another edition)