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Bureau of Mines / Minerals yearbook 1992
Year 1992, Volume 2 (1992)
Peterson, Eileen K.; Cappa, James A.
Colorado, pp. 113-129 ff.
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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




