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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr9 Apr98 <br /> 2 De (Feb <br /> "° b Oct99 <br /> cn 1 Dec97 <br /> N <br /> n97 Feb98 pr9 <br /> Au99ROct96 itgh <br /> 11 <br /> N <br /> 0 <br /> E <br /> o Jun ug ct97 <br /> Z -1 Jun9$Aug98 Jun g99 <br /> -2 <br /> 1 2 3 4 5 6 7 8 9 1011 1213141516171819 20 2122 23 24 25 26 27 28 29 30 3132 33 34 35 36 37 38 39 40 41 <br /> Period <br />