http://www.psrd.hawaii.edu PSRD is an educational journal sharing the latest research on meteorites, planets, and other solar system bodies being made by NASA-sponsored scientists. en-us http://www.psrd.hawaii.edu/April08/Dewar-Th.html Findings show geochemical enhancements in the Dewar region are caused by thorium-rich mare basalt fragments in the regolith. http://www.psrd.hawaii.edu/April08/Dewar-Th.html Wed, 30 April 2008 00:24:00 GMT