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<br /> <br />EXHIBIT 4 <br /> <br />TO <br /> <br />* <br />MEXICO 1971 - 1972 <br /> <br />R.G ES BELOW <br /> <br />MORELOS DAM <br /> <br />JU~Y <br /> <br />!s~ <br />. 1(:,' ~~ <br /> <br />.,[?fEr.18E!;" <br /> <br />OCTr::BfP <br /> <br />r,c,vEI.'i:;ER <br /> <br />DECEI\18H1 <br /> <br />" .'), <br /> <br />>, > <br /> <br />.:: t' ~o < '; <br /> <br />~. .~ <br /> <br />~ 01 J~ <br /> <br />7000 <br /> <br /> ~-~ 6000 <br /> -~ - <br /> I - .- 5000 <br /> <f> <br /> ~ <br />-L - ~- ---- <br /> u <br /> z <br /> j - - 4000 <br /> w <br /> '" <br /> I " <br /> ~ <br /> + r <br /> u <br /> <f> <br /> - <br /> 0 <br /> , - 3000 <br /> I -- <br /> ~ <br /> ~ <br /> .. <br /> - --+-- .~ 0 <br /> - <br /> z <br /> ~ <br /> w <br /> 2000 " <br /> <br />-, <br /> <br />..1.__ <br /> <br />-.....'----.-- <br /> <br />1000 <br /> <br />500 <br /> <br />,,jG J5T <br /> <br />'Of.. -::,~eE..... <br /> <br />,~ -: z'o <br />T :;i3[R <br /> <br />~ .- <br /> <br />.<.'I;.'''[,EI1 <br /> <br />, - ~.~ ;....--- 0 <br />'ll;.vrY&fP <br /> <br />'5 l~ 1~ <br />U", <br /> <br />- ,~ :0 2: <br /> <br />r y Al Son Luis <br /> <br />'ltj( ;;2 c:f~ <br /> <br /> <br />7' - 31- 72 <br />