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' �rrr fir/ <br /> TABLE 2(continued) <br /> Sources: (1) Hawkes, H.E. and Webb, J.S., 1962, Geochemistry in Mineral Exploration: Harper and Row <br /> Publishers,New York,N.Y.,415 p. <br /> (1) Levinson, A.A., 1980, Introduction to Exploration Geochemistry (2nd Edition): the 1980 <br /> Supplement: Applied Publishing Ltd.,Wilmette,IL,924 p. <br /> (2) Dobrovolsky,V.V., 1994,Biogeochemistry of the World's Land. CRC Press,Boca Raton,FL, <br /> 362p. <br /> (3) Kirkham, M.B., 1979, Trace Elements, in R.W. Fairbridge and C.W. Fink], Jr. eds.), The <br /> Encyclopedia of Soil Science,Part 1: Dowden,Hutchinson&Ross,Inc.,Stroudsburg,PA, <br /> p.571-574. <br /> (4) Shacklette,H.T. and Boerngen, J.G., 1984,Element Concentration in Soils and Other Surficial <br /> Materials ofthe Conterminous United States: U.S.Geological Survey Professional Paper No. <br /> 1270,Washington,D.C., 105 p. <br /> (5) Pettygrove, G.S. and Asano, T., 1984,Irrigation with.Reclaimed Municipal Waste Water-A <br /> Guidance Manual: Lewis Publishers,Chelsea,IviI(see Appendix I). <br /> Hygienetics® <br /> Environmental <br /> 4234.001\backgnd.tbl <br /> I <br />