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-~ REFERENCES <br />ASTM, 1980, "Gaseous Fuels; Coal and Coke; Atmospheric Analysis: Annual <br />Book of ASTM Standards", Part 26, ASTM 1916 Race St,, Philadelphia, <br />Penn., 19103. <br />ASTM, 1980, "Water: Annual Book of ASTM Standards," Part 31, ASTM 1916 <br />Race Street, Philadelphia, Penn., 19103. <br />Colorado School of Mines Research Institute. 1977. Topsoil Depth <br />Requirements for Surface Mined Areas. P, 0. Box 112, Golden, <br />Colorado 80401. <br />U.S. Environmental Protection Agency, 1978. "Field and Laboratory <br />Methods Applicable to Overburdens and Mine soil" EPA-600/2-78-054, <br />Industrial Environmental Research Laboratory, Cincinnati, Ohio 45268 - <br />March 1978. <br />Soltanpour, P.M. 1977. "Extraction of Heavy Metals in Soils by Ammonium <br />Bicarbonate - Diethylene Triamine Pentaacetic Acid (AB-DTPA) <br />Method" Colorado State Univer., Soil Testing Laboratory, Ft. Collins, <br />CO. <br />"Standard Methods for the Examination of Water and Wastewater", 14th <br />Edition, 1975 American Public Health Assoc., American Water Work <br />Assoc., Water Pollution Control Federation. <br />U.S. Environmental Protection Agency, 1978 "Methods for Chemical Analysis <br />of Water and Wastes", EPA-600/4-79-020, Environmental Monitoring and <br />Support Laboratory, Cincinnati, OH, 45268 March 1979. <br />Watanabe, F.S. and S.R. Olsen. 1965. "Test of an Ascorbic Acid Method for <br />Determining P in Water and NaHCO3 Extracts from Soil", Soif Sci. Soc. <br />Amer. Proc. 29:677-678. <br />.~ <br />Ni7v Z 3 I9ai <br />6-165 <br />