Phosphate rock availability-world : a minerals availability program appraisal /
by R.J. Fantel ... [et al.].
- Washington : U.S. Dept. of the Interior, Bureau of Mines, 1984.
- v, 65 p.
- Information circular ; 8989 .
Phosphate industry.
Phosphate minea and mining.
Phosphate industry.
Phosphate minea and mining.