“We are three quarters of a mile in the depths of the earth, and the great river shrinks into insignificance, as it… — Kevin Fedarko Copy Share Image
We have an unknown distance yet to run, an unknown river to explore. What falls there are, we know not; what rocks… — John Wesley Powell Copy Share Image
We are now ready to start on our way down the Great Unknown. Our boats...are chafing each other, as they are tossed… — John Wesley Powell Copy Share Image
We have an unknown distance yet to run, an unknown river to explore. — John Wesley Powell Copy Share Image
