The Henry Mountains, located in southeastern Utah, were one of the last-surveyed mountain ranges in the continental United States. In 1875, J.P. Powell assigned Grove Karl Gilbert to study the unique volcanic features of the Henrys, a project which took Gilbert two seasons to complete. Out of this study came the Report on the Geology of the Henry Mountains. The report consists of 170 pp. of text, 5 plates at the back, and a frontispiece of Mount Ellsworth. Quarto, hardbound in green cloth covered boards with gilt title on spine.

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Condition: B+

Text and plates are very good with the plates at back being detached from the text block. Covers and spine are worn and faded, and there are several small holes along the spine. The hinge is starting.