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Spring G-37 <br />• <br />1 <br />C. Iron and Manganese <br />Fein <br />Mnm <br />m <br /> <br /> <br />0 ~--~ <br />90 91 <br />92 93 94 95 96 97 98 99 00 <br />Year <br />D. Major Chemistry <br />90 91 92 93 94 95 96 97 98 99 00 <br />Year <br />2000 <br />1800 <br />1600 <br />1400 <br />1200 <br />rn 1000 <br />E <br />800 <br />600 <br />400 <br />200 <br />0 <br />