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dZN (mg/1) <br /> O N -ph. (3) w O <br /> 31 -Jan-92 <br /> 31 -Jan-93 0 <br /> rn <br /> ic <br /> 31 -Jan-94 rn <br /> Z <br /> 31 -Jan-95 n� <br /> ' <br /> co v <br /> rn <br /> > rn <br /> m 31 -Jan-96 <br /> C� <br /> 31 -Jan-97 n <br /> 31 -Jan-98 <br /> 31 -Jan-99 <br />