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pubs.usgs.gov · 66 UPPER 72 32 MIDDLE 80 24 WINZE 4 Peg 63 PROFESSIONAL PAPER 229 PLATE 4 72 73 62 55 CRIBBED peg Structure projected from back of stope LEVEL LEVEL 85 45 30 + 85

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Page 1: pubs.usgs.gov · 66 UPPER 72 32 MIDDLE 80 24 WINZE 4 Peg 63 PROFESSIONAL PAPER 229 PLATE 4 72 73 62 55 CRIBBED peg Structure projected from back of stope LEVEL LEVEL 85 45 30 + 85