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--~,. - <br />NAHC03 EXTRACTED FROM MINE <br />3500 <br />3000 <br />1500 <br />T <br />0 <br />n <br />s <br />2000 <br />N P <br />r <br />0 <br />d 1500 <br />u <br />e <br />e <br />d <br />1000 <br />500 <br /> <br /> 0 <br /> <br />Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec <br />1992 <br />