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.
Major extinctions of land-dwelling vertebrates at the Cretaceous-Tertiary boundary, eastern Montana
Peter M. Sheehan
Geology(1992),20(6):556
http://dx.doi.org/10.1130/0091-7613(1992)020<0556:MEOLDV>2.3.CO;2

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