Description based on: 1985; title from caption.
Microfiche. <1986, prelim.-> Washington, D.C. : Supt. of Docs., U.S. G.P.O. microfiches : negative.
Vols. for 198 -1989 prepared in the Branch of Industrial Minerals; 1990- in the Branch of Industrial Minerals and Branch of Data Collection and Coordination.
Issued also in quarterly ed.