International strategic minerals inventory summary report : niobium (columbium) and tantalum /
Crockett, R. N.
Sutphin, David M.
Geological Survey (U.S.)
[Washington, D.C.?] : U.S. G.P.0. ; Denver, Co : Map Distribution,
1993.
"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."
"Issued by U.S. Geological Survey."
Shipping list no.: 93-0305-P.
Includes bibliographical references (p. 34-36).
Niobium ores.
Tantalum ores.
Strategic materials.
Raw materials.