Note 5 — Chapter V · LAND SCULPTURE.
Reading edition
Geology of the “Colorado Exploring Expedition”, by J. S. Newberry, p. 45.
“Exploration of the Colorado River of the West”, by J. W. Powell, p. 152.
“Geology of the Uinta Mountains”, by J. W. Powell, p. 181.
“Explorations West of the 100th Meridian”, Vol. III, Part I, by G. K. Gilbert, pp. 67 and 554.
“The Colorado Plateau Region” in American Journal of Science for August, 1876, by G. K. Gilbert.
A portion of the last paper is repeated, after modification, in the first section of this chapter.