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.. �.. , . ..�.�.��:��.. . . . . � . � . <br /> . . =.��a�.... _ <br /> ... \ <br /> , { <br /> �� I <br /> References <br /> USGS, Summary o Typical Metals Cm«e* +n m Soils aSrzczal Materials, U.S.G.S. <br /> . Pr f piona Paper 127 f r the Conterminous United States, Apr! 1992, <br />. � <br /> } � <br /> \ <br /> ] � <br /> \ ©` � <br /> ) w\9690\R0OR79\SUB UKdoo <br /> je <br /> s . I H <br /> ] <br /> 2 <br /> \ <br />