pubs.usgs.gov · 66 upper 72 32 middle 80 24 winze 4 peg 63 professional paper 229 plate 4 72 73 62...
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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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