Vydavatel U.S. Geological Survey, Department of the Interior
Datum vydání před téměř 10 roky
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This map layer includes ferrous metal mines in the United States. The data represent commodities covered by the Minerals Information Team (MIT) of the U.S. Geological Survey, and the operations are those considered active in 2003 and surveyed by the MIT. This is a replacement for the November 1998 map layer.