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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> I <br /> 3 Apr9 Apr98 <br /> 2 Dec98 Feb9 ! <br /> N Dec97 eb9 <br /> 1 Feb98 ec9 <br /> Aug96 Oct96 un97 <br /> N Oct9 <br /> 'E 0 <br /> Jung9 lug9 ct97 <br /> Z -1 Jun98 Aug98 <br /> -2 <br /> -3 <br /> 1 2 3 4 5 6 7 8 9 1011 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 <br /> Period <br /> B-17 <br />