scientific article published on May 2009
author: John P. Grotzinger, Andrew H. Knoll, Timothy J. McCoy, Wendy M. Calvin, Christian Schröder, Raymond E. Arvidson, Scott M. McLennan, Kenneth E. Herkenhoff, David W. Mittlefehldt, Lauren A. Edgar, Goestar Klingelhoefer, Douglas Ming, Brad L. Jolliff, Barbara Cohen, Matthew P. Golombeck, Ralf Gellert, John A. Grant, Steven Squyres, James F. Bell, III, Alexander Gerard Hayes, William H. Farrand
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