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-10 <br />-il <br />-12 <br />-13 <br />-14 <br />~ -15 <br />W <br />F <br />3 -16 <br />0 -17 <br />t <br />-18 <br />w <br />O <br />-19 <br />_nn <br />-21 <br />-22 <br />-23 <br />6/85 <br />BLUE RIBBON COAL COMPANY <br />PIEZOMETER P-1 <br />12/85 6/86 12/86 6/87 12/87 6/88 <br />DATE <br />