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r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009
r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009
r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009
r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009
r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009
r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009
r2r2r: a Grand Canyon experiment
Created: Sep 25, 2009