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Over its long history, the U.S. Geological Survey has taken many, many, photographs. In the course of their various geological studies and explorations, persons in their employ have documented volcanic explosions, mining projects, and dams. This website contains 30,000 photographs from 1868 to the present, and many of these images have never been published in any form. New users can get started by clicking one of the subject areas on the left-hand side of the homepage. These areas include "Earthquakes", "Mines, Mills, Quarries", and "Mount St. Helens". Visitors can also perform basic keyword searches, and they might wish to try out words like "dolomite", "karst", or "Colorado". Also, the site has an excellent "Portrait Gallery", which contains images of famed geological pioneers, such as Chares Van Hise.
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