![](http://www.alamy.com/thumbs/6/B24A8C6D-FFE6-4170-A05A-60C1C4A858BE/HBYF24.jpg)
Image taken from page 181 of 'Economic Mining. A practical handbook for the miner, the metallurgist, and the merchant' Image taken from page 181 of 'Economic Mining A practical
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Photo credit: © Classic Collection / Alamy / Afripics
License: Licensed
Model Released: No
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