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Beck, R. Die Diamantlagerstatte von Newland in Griqua 

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Berlin, Zs. prakt. Geol., 1899, 417-419. 



Lehre von den Erzlagerstatten. 



Berlin, 2 ed., 1903, 8vo, xxx + 732 pp., 1 pi., 257 ffg. 



Becker, G. F. The Witwatersrand banket, with notes on 

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Washington, U. S. Geol. Surv., Ann. Rep., 18, 5, (1896-97), 153-184, pi. i. [map]. 

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 Stuttgart, N. Jahrb., 1899, 1, 89-92. 



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New York, Science, 6, 1897, 664-667. 



