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Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1972
(1972)
Koelling, Gordon W.
Helium, pp. 605-610
Page 605
![[page image]](http://images.library.wisc.edu/EcoNatRes/0021/0001/M/0613.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




