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A-72 Project Period <br /> N departure of zinc concentration <br /> 4 <br /> 3 Apr9 Apr98 <br /> 2 Dec96 Feb9 <br /> CDDec97 <br /> eb <br /> � 1 <br /> N Aug96 Oct96 <br /> un97 Feb98 ec9 ig <br /> Oct9� <br /> E Jun9 �lug9 ct97 <br /> Z -1 Jun98 Aug98 <br /> -2 <br /> 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 <br /> Period <br />