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Caterpillar proving grounds, equipment operation
Arthur Lakes Library ; Russell L. and Lyn Wood Mining History Archive ; United States. Bureau of Mines
Arthur Lakes Library
Russell L. and Lyn Wood Mining History Archive
United States. Bureau of Mines
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1971-06
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Abstract
A man in a hardhat stands with his back to the photographer, observing a piece of equipment traveling on a slope at the Caterpillar proving grounds, probably near Tucson, Arizona.
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