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<br />MIDDLE CREEK ABOVE MINE 3, USGS STATION 09234700 (700) <br />MEAN QUARTERLY CONDUCTIVITY, FIELD <br />~~ <br />U <br />O <br />2 <br />T <br />n <br />C <br />Z1 <br />m <br />G <br />e <br />• <br /> <br />19 80 198 7 19 62 198 3 19 84 1985 198 6 1987 1988 19 89 1990 1991 19 92 <br />