The Geological Society of America

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The Geological Society of America provides access to elements that are essential to the professional growth of earth scientists at all levels of expertise and from all sectors: academic, government, business, and industry.
The Sudbury impact layer in the Paleoproterozoic iron ranges of northern Michigan, USA
W.F. Cannon
Geological Society of America Bulletin(2010),122(1-2):50
http://dx.doi.org/10.1130/B26517.1

The Geological Society of America
The Geological Society of America
GeoScienceWorld
GeoScience World