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Earthquake: prelude to the Big One?

GEO Canby, Thomas Y. ERQK Earthquake: prelude to the Big One? Nat Geo, May, 1990
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Earthquakes and volcanoes

GEO Earthquakes and volcanoes. Scientific American, 1980.
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aults and earthquakes in California

GEO Faults and earthquakes in California. DMG, 1986.
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Fault-rupture hazard zones in California

GEO Hart, Earl W. ERQK Fault-rupture hazard zones in California. DMG 1990
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