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Bureau of Mines / Minerals yearbook metals and minerals 1987
(1987)
Tepordei, Valentin V.
Sand and gravel, pp. 745-758
Page 745
![[page image]](http://images.library.wisc.edu/EcoNatRes/0007/0001/M/0753.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




