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<br />002-699 <br /> <br />'" <br />a: <br /><l: <br />-' <br />-' <br />o <br />o <br /> <br />~ 200 <br /> <br />'" <br />z <br />o <br />-' <br />-' <br />::E <br /> <br />400 <br /> <br />300 <br /> <br />I <br /> <br />100 <br /> <br /> <br />o <br /> <br />1965- <br />1980- <br /> <br />1980- <br />2000 <br /> <br />2000- <br />2020 <br /> <br />Figure 34.-Recreation navigation installation cost. <br /> <br />'" <br />a: <br /><l: <br />-' 3 <br />-' <br />o <br />o <br />u. <br />o <br />'" <br />z <br />o <br />-' 2 <br />-' <br />:IE <br /> <br />Navigation <br /> <br /> <br />4 <br /> <br />illllll!III!I!11111111 <br /> <br />.:.;.;.;.:.:.:.:.:.;.; <br /> <br />o <br /> <br /> <br />1980 <br /> <br />2000 <br /> <br />2020 <br /> <br />Figure 35.-Recreation navigation operation and main- <br />tenance cost. <br /> <br />81 <br />