Full Article Erosion of the Grand Canyon of the Colorado River Part I--Review of Antecedent River Hypothesis and the Postulation of Large Quantities of Rapidly Flowing Water as the Primary Agent of Erosion Emmet L. Williams, Ph.D., John R. Meyer, Ph.D., and Glen W. Wolfrom, Ph.D.
(Ph.D.; [is] the Primary Agent of; Erosion Emmet L. Williams)
Ph.D.
[is] the Primary Agent of
Erosion Emmet L. Williams