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Comet/Asteroid Impacts
and Human Society
ed by Peter T. Bobrowsky
and Hans Rickman
intro (PDF)
due to links here

15 posted on 05/08/2008 6:34:55 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/_______________________Profile updated Monday, April 28, 2008)

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Whoops.

16 posted on 05/08/2008 6:35:20 PM PDT by SunkenCiv (https://secure.freerepublic.com/donate/_______________________Profile updated Monday, April 28, 2008)

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