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BLUE RIBBON COAL OOMPANY <br /> 0 <br /> -f0 <br /> <br /> -20 <br /> <br />3 <br />0 <br /> <br />_ -30 <br />w <br />0 <br /> -ao <br /> <br /> -50 <br /> 6/85 12/85 <br />PIEZOMETER P-3 <br />6/86 12/86 6/87 12/87 <br />6/B8 12/88 6/89 <br />DATE <br />