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<br />OC2918 <br /> <br />by <br />Georgo R8rgslcn <br />Gaylord V Skogerbo8 <br />Wynn R Walker <br /> <br />Colorado 51;:]!" University <br />Department of Aqrltulluri'll Crlqlrleenng <br /> <br />In cooperalllHl with <br />James P l,(-tw, ,I' <br />US EnVlrQrlmentill ~'rotp.c1lnn Agency <br /> <br />rebruary 1974 <br /> <br />THE GPAND VALLEY <br />an environmental chall~ <br /> <br />Editor Peter G Snl,th <br /> <br />,^-rt [)I~cr::nf~. 8~~b C()()r:!,-: :_H~d Rick ,^.ust <br /> <br />neslgner Rick ,l\ust <br />