Four dignitaries unveil the plaque dedicated to the memory of John Wesley Powell during a Powell Commemorative Ceremony on Lakeshore Drive, just upstream from Glen Canyon Dam at Lake Powell. From left to right, the people identified include: Governor Jack Williams of Arizona; Chairman Raymond Nakai of the Navajo Tribe; Assistant Secretary of the Interior James R. Smith; and Governor of Utah Calvin L. Rampton.

57 x 46 cm., on sheet 83 x 91 cm., folded in envelope 30 x 24 cm. Relief shown by contours and spot heights. "Geology mapped in 1963." Includes 2 colored cross sections, index map, text, and quadrangle location map. "Prepared in cooperation with the U. S. Atomic Commission." Original publisher: Interior, Geological Survey, Series: Geologic quadrangle map GQ, Scale: 1:24 000.