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I'll have a look and build on what I can find there. It's a curious subject. I know a professor whose entire professional life has been topics South America. He's even been to Potosi. I asked him one day about this subject, whether he knew anything about it, and had any advice to give on possible sources. He had no knowledge of it whatsoever. I was stunned. Thanks for finding this! --Hammersoft (talk) 18:48, 8 December 2020 (UTC)[reply]