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Bureau of Mines / Minerals yearbook metals, minerals, and fuels 1976
(1976)
Ryan, J. Patrick; Hague, John M.; Rathjen, John A.
Lead, pp. 727-755 ff.
Page 727
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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




