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This photograph was taken from a car on the Denver & Rio Grande Railroad sometime around 1899. The photographer is presumed to be Prof. Charles Peter Berkey. Professor Berkey was in Colorado as part of a school trip from the University of Minnesota. He came with mining students from that university to study the "practical science of mining."
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This photograph of the Eagle River Canon was taken around 1885 by Alexander Martin. At the center-bottom of the image, you can see the tracks of the Denver & Rio Grande Railroad. In the cliffs above, you can see various structures and buildings that are no doubt related to mining activities in the area.