TY  - BOOK
AU  - Crockett,R.N.
AU  - Sutphin,David M.
TI  - International strategic minerals inventory summary report: niobium (columbium) and tantalum 
U1  - 333.85465 
PY  - 1993///
CY  - Washington
PB  - U.S. Government Printing Office
KW  - Niobium ores
KW  - Tantalum ores
KW  - Strategic materials
N1  - 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
ER  -