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N <br />R7 <br />c <br />A <br />F. <br /> <br /> <br />NAHCO3 EXTRACTED FROM MINE <br />160 <br />140 <br />120 <br /> <br />N <br />A <br />H 100 <br />C <br />O <br />3 80 <br />T <br />~ 60 <br />N <br />S <br />40 <br /> <br />20 <br /> <br />0 <br /> <br />20-Fa6 13-Mer 3-Apr 24-Apr 16-Mey 6Jun 26Jun 17Ju1 7-Aup 28-Aup <br />1991 <br />