Page View
Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1972
(1972)
Meisinger, Arthur C.
Pumice and volcanic cinder, pp. 1069-1073 ff.
Page 1069
![[page image]](http://images.library.wisc.edu/EcoNatRes/0021/0001/M/1077.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




