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• United States E.P.A. 1977. Subirrigated Alluvial Valley Floors: A Reconnaissance of Their <br />Properties and Occurrence in Coal Resource lands in the Interior Western United States. <br />VanVoast, W.A. and R.B. Hedges. 1975. Hydrogeologic Aspects of Existing and Proposed <br />Strip Coal Mines Near Decker, Southeastern Montana: Montana Bureau of Mines and Geology <br />Bulletin 97. 31 p. <br /> <br /> <br />16-iD <br />