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1.- Paleomagnetic and Ar-40/Ar39 results from the Gant intrusive breccia and comparison to the Permian Downey Bluff sill: Evidence for permian igneous activity at Hicks Dome, southern Illinois basin Goldhaber,Martin; Reynolds, Richard; Snee, Lawrence W. Washington: USGS, 1997 U.S. Geological survey Bulletin Revistas Ver registro
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