There's one section of "Cauldron of Hell: Tunguska" that is among the most frightening ever written, fact or fiction...It is the destruction of London, which would have occurred if the Tunguska fireball arrived hours later...This book gives a good account of the events surrounding the Tunguska event...Even though it was written 20 years ago, much of it is still essential reading for those interested in the threat posed by cosmic impacts...
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