2001. U.S. Geological Survey. This data set includes construction minerals operations in the United States. The data represent commodities covered by the Minerals Information Te...
2001. U.S. Geological Survey. This data set includes miscellaneous industrial minerals operations in the United States. The data represent commodities covered by the Minerals In...
2001. U.S. Geological Survey. This data set includes refractory, abrasive, and other industrial minerals operations in the United States. The data represent commodities covered ...
2001. U.S. Geological Survey and Florida Caribbean Science Center. A small mollusk called the zebra mussel has been steadily invading America's rivers and lakes. Zebra mussels colonize water intake pipes and severe...