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<br />'-' <br />~150- <br />- <br /> <br />AVERAGE YIELD DIFFERENTIAL <br /> <br /> - <br /> - ~ <br /> ,- <br />,- <br /> <br />>00. <br /> <br />250- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />'" 0- <br />u. 1972 19'70 1974 1975 1976 1977 <br /> <br />'-' <br />0::1&0- <br />~ <br /> <br />AVERASE EARNINSS DRYLAND <br /> <br /> ,- <br /> - <br />- - - <br /> <br />SDD- <br /> <br />2!iO- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 1970 1974 1975 1976 1977 <br /> <br />... <br />0:1&0- <br />~ <br /> <br />o <br />Q <br />i"\J <br />,.... <br />0" <br />. ~..... <br /> <br />GROUNDWATER <br />MANAGEMENT <br />DISTRICT <br />3 <br /> <br />AVERASE IIlRISATllJl EARNINGS <br /> <br /> ~ <br /> - - <br /> - <br />- <br /> <br />:lllll- <br /> <br />2&D- <br /> <br />200- <br /> <br />100- <br /> <br />50- <br /> <br />0- <br /> <br />1972 19'70 1974 1975 1976 1977 <br />