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* Impact Cratering: An overview of Mineralogical and Geocemical Aspects by Christian Koeberl

* MIT Crosby Lectures in Geology: History of Africa, Fall 2005 (MIT OpenCourseWare)

Hi Resolution Science Imaging Experiment (University of Arizona)

*
Meteorites from Earth: The Tale of Tektites By Richard Jakiel  

* The Lately Tortured Earth by Alfred deGrazia

* Astrophotography by Tom Matheson

* Super Huge Impact Tectonogenesis

*
Appalachian Tectonic Study Group

* Dave Weir's Meteorite Studies

* GeoScienceWorld.org

* The Plantary Society

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