Including Original "Paul H. Letters" Copyright © 1996-2017 Paul V. Heinrich - All rights reserved.



Sunday, 1 July 2012

June 30, 1908: The Tunguska Event

June 30, 1908: The Tunguska Event

June 30, 1908: The Tunguska Event by David Bressan
History of geology, Scientific American, June 30, 2012
http://blogs.scientificamerican.com/history-of-geology/2012/06/30/june-30-1908-the-tunguska-event/

Best wishes,

Paul H.