05(U.S.Geol.)
Geol	U.S.Geological Survey     U.S.Geological Survey Bulletin [Текст]. — Washington : United States Government Printing Office, 1997. — № 2094-G : Paleomagnetic and 40/Ar/39/Ar Results from the Grant Intrusive Bressia and Comparison to the Permian Downeys Bluff Sill - Evidence for Permian Igneous Activity at Hicks Dome, Southern Illinois Basin. — fig.