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A. John Wesley Powell: pioneer statesman of Federal science, by M. C. Rabbitt.
B. Stratified rocks of the Grand Canyon, by E. D. McKee.
C. Geologic history of the Colorado River, by C. B. Hunt.
D. The rapids and the pools
Grand Canyon, by L. B. Leopold.
B. Stratified rocks of the Grand Canyon, by E. D. McKee.
C. Geologic history of the Colorado River, by C. B. Hunt.
D. The rapids and the pools
Grand Canyon, by L. B. Leopold.