Page View
Bureau of Mines / Minerals yearbook metals and minerals 1987
(1987)
Cunningham, Larry D.
Columbium and tantalum, pp. 279-288
Page 279
![[page image]](http://images.library.wisc.edu/EcoNatRes/0007/0001/M/0287.gif)
As a work of the United States government, this material is in the public domain.| For information on re-use see: http://digital.library.wisc.edu/1711.dl/Copyright




