![](http://www.alamy.com/thumbs/6/12EDC717-F618-456A-8B1F-576F91CD92F5/HC0TW5.jpg)
Image taken from page 624 of 'Economic Mining. A practical handbook for the miner, the metallurgist, and the merchant' Image taken from page 624 of 'Economic Mining A practical
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Photo credit: © Classic Collection / Alamy / Afripics
License: Licensed
Model Released: No
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