We are three quarters of a mile in the depths of the earth, and the great river shrinks into insignificance as it dashes its angry waves against the walls and cliffs that rise to the world above… We have an unknown distance yet to run, an unknown river to explore. What falls
We had accomplished an object of laudable ambition, and beyond the strict order of our instructions. We had climbed the loftiest peak of the Rocky Mountains, and…standing where never human foot had stood before, felt the exultation of first explorers.” John C. Frémont around 1842 (Jackson and Spence, 1970, p. 45).
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