Pillalamarri, Ila, 12.091 Basics of Impact Cratering & Geological, Geophysical, Geochemical, Environmental Studies of Some Impact Craters of the Earth, January (IAP) 2008. (Massachusetts Institute of Technology: MIT OpenCourseWare), http://ocw.mit.edu (Accessed 24 Nov, 2009). License: Creative Commons BY-NC-SA

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