Phosphate rock
Subtitle: a chapter from Mineral facts and problems, 1985 edition
Contributors: United States. Bureau of Mines
Publisher: U.S. Dept. of the Interior, Bureau of Mines
Published: 1985
Place of publication: [Washington, D.C.?]
Language: eng
Number of pages: 16
Subjects: Phosphate rock
Other titles: Mineral facts and problems
Notes: Cover title

At head of title: Bureau of Mines preprint from Bulletin 675

Includes bibliographical references