Directory of companies mining talc and pyrophyllite in the United States in ...
United States.Branch of Industrial Minerals.
Washington, D.C. : U.S. Department of the Interior, Bureau of Mines
At head of title: U.S. Department of the Interior, Bureau of Mines.
Description based on: 1992; title from caption.
Vols. for  prepared in the Branch of Industrial Minerals.
Talc industry
Soapstone industry
Pyrophyllite industry