http://www.blackwell-synergy.com/doi/full/10.1111/j.1365-3121.2007.00742.x?cookieSet=1
FYI Charles O'Dale President RASC - Ottawa Centre http://www.ottawa.rasc.ca/index.php http://www.ottawa.rasc.ca/articles/odale_chuck/earth_craters/index.html
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