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This is at least the second time I've read this message. I meant to comment 
about it the first time from wherever I saw it previously. But the figure of 
2200 square kilometers of damage seems quite high to me. I just looked up in 
Richard Nortons book "Rocks from Space" that showed an approximate dimension 
of damage from the tunguska event to be in the neighborhood of about 20X25 
miles. In Square miles this would be about 500. My conversion into kilometers 
is rocky, but I would think it would be at least less than 1000? 
George Zay

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