Domestic clay production.
United States.Bureau of Mines.
United States.Branch of Industrial Minerals.
United States.Bureau of Mines.Branch of Data Collection and Coordination.
Washington, D.C. : U.S. Department of the Interior, Bureau of Mines
Vols. for  prepared by: the Branch of Industrial Minerals and Branch of Data Collection and Coordination.
Clay
Clay industries
Issued also to depository libraries in microfiche.
Clays in ...