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A Surprisingly Short History of Deep Time at the Grand Canyon by Paul Hirt - Part 4
A Surprisingly Short History of Deep Time at the Grand Canyon by Paul Hirt - Part 5
A Surprisingly Short History of Deep Time at the Grand Canyon by Paul Hirt - Part 1
A Surprisingly Short History of Deep Time at the Grand Canyon by Paul Hirt - Part 3
Geodyssey: Deep Time
7 Water Symposium: In Deep - Banff - Paul Hirt Presentation
Questioning Deep Time
Make the most of LIFE: Geological Timescales
Places - The Grand Canyon
Geology at the Grand Canyon
National Park Service
Where is the Grand Canyon? (3 of 23)
