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<br />. <br /> <br />, ' <br /> <br /> <br />.;:.., <br />~. <br />o <br />w <br /> <br /> <br />- <br />l1li <br />o <br /> <br />50-900m.. overburden <br /> <br />1 ess than 50 m overburden <br /> <br />greater than 900 mover- <br />burden <br /> <br />.; <br /> <br />,;;, .. -~. <br /> <br />,.,', <br /> <br />i <br />1,- <br />, <br />'. <br />, <br /> <br />I <br /> <br />" <br /> <br />tl <br /> <br />,,-..- <br /> <br />.,;.. <br /> <br />~~,:o:-=a-~~_:=:::::==::::::::~:::"--:""~~O ..", <br /> <br />,~~_=::::,.:::::::::!~,~,~o""~.,.. <br /> <br />Figure 9. Coal c1eposits in the Upper Colorado River BaBin (Flug et al., 1977). <br /> <br />26 <br />