Columbium (Niobium) and tantalum /
Albert, Bouchard.
Columbium (Niobium) and tantalum / Bouchard Albert. - Ottawa : Dept. of Energy, Mines and Resources, 1975. - 7 p. ; 25 cm. - 1977 ; no. 17 .
Niobium ores -- Canada.
Tantalum -- Canada.
G CAN E64 (08) 3/17
Columbium (Niobium) and tantalum / Bouchard Albert. - Ottawa : Dept. of Energy, Mines and Resources, 1975. - 7 p. ; 25 cm. - 1977 ; no. 17 .
Niobium ores -- Canada.
Tantalum -- Canada.
G CAN E64 (08) 3/17