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Bureau of Mines / Minerals yearbook area reports: international 1972
(1972)
Welch, J. R.; Whitman, Robert A.; Reed, Avery H.
South American areas, pp. 947-955 ff.
Page 947
![[page image]](http://images.library.wisc.edu/EcoNatRes/0021/0003/M/0955.gif)
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