The road in this direction leads through the roughest mountain passes; and, in some places, it winds so close along the borders of precipices, that by a single misstep an animal might be precipitated several hundred feet. Mules, however, are very surefooted; and will often clamber along the most craggy cliffs with nearly as much security as the goat.

Commerce of the Prairies (1831–1839), Chapter 22 - Visit to Town of Jesus-Maria — Anti-Masonic Auto de Fe