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Photograph Nu. 7. Research Minr (root face of shotcrcted concrete sack dam, showing <br />discharge pipe. steel door is in background. <br />West~m lNatsr b Land, Inc. page Q o f 4 <br />Photograph No. R. Research ?dine front face of shotcreted concrete sack dam, showing <br />discharge pipe :uid shotcrcted ribs in front ul'd:un. <br />