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pp 570 plate 3 4 - USGS · united states department of the interior geological survey —.00 0 stope ph 600' 600' db 600 00' 500 prepared in cooperation geological survey

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Page 1: pp 570 plate 3 4 - USGS · united states department of the interior geological survey —.00 0 stope ph 600' 600' db 600 00' 500 prepared in cooperation geological survey

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