International strategic minerals inventory summary report
Subtitle: niobium (columbium) and tantalum
By: by Richard N. Crockett and David M. Sutphin.
Contributors: Sutphin, David M.
Series: U.S. Geological Survey circular ;; 930-M
Publisher: U.S. G.P.0.; Map Distribution
Published: 1993
Place of publication: [Washington]
Language: eng
Number of pages: 36
Subjects: Niobium ores.; Tantalum ores.; Strategic materials.
Notes: Includes bibliographical references (p. 34-36).
"Prepared as a cooperative effort among earth-science and mineral-resource agencies of Australia, Canada, the Federal Republic of Germany, the Republic of South Africa, the United Kingdom, and the United States of America."