Direct preparation of phosphoric acid from intermediate-grade western phosphatic shale /
by Philip C. Good, T. N. Goff, and C. B. Daellenbach.
- Pittsburgh, Panama : U.S. Dept. of the Interior, Bureau of Mines, 1981.
- 12 p. : ill.
- Report of investigations ; 8534 .
- Report of investigations (United States. Bureau of Mines) ; 8534. .