TY  - JOUR
T1  - Columbium and tantalum in ...
CY  - Washington, D.C. :
CN  - I 28.141:
CN  - HD9539.N54
PB  - U.S. Dept. of the Interior, Bureau of Mines,
PP  - Washington, D.C. :
N1  - Not distributed to depository libraries.
N1  - Description based on: 1979 preliminary; title from caption.
ID  - 165165
KW  - Niobium
KW  - Tantalum
TI  - Columbium and tantalum in ...
ER  -