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Bureau of Mines / Minerals yearbook mineral industries of Europe and the U.S.S.R. 1990
(1990)
Plachy, Jozef
Czechoslovakia, pp. 52-[61]
Page 52
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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




