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Show 8 6 2 Helms a ( nota note ) ( in ill ) the section ( from froiii ) ( mile inile ) 101 to 93 , ( "Good Good ) river . ( '7 " ) ( ( E R ) . 1258-1259 . ) In other words the river was ( in ill ) good condition ; there was no ( mate inate- inate ) ¬ rial stream that ( came carne ) in . The ( Escalautc Escalailte ) river is shown ( on oil ) this ( chart elvart ) at mile ( 88 8S ) . At mile 87 he notes ( "Rock Rock ) out ( in hi ) the ( river" river ) as a permanent landmark , not as any particular danger to navigation . ( R . 1259 . ) At mile ( 78M 781X ) > , approximately , is the mouth of the ( San Saii ) Juan river . This is Sheet 6 , ( Oompl Compl ) . Exh . 10 . Beginning at the mouth of the San Juan river began to encounter sand waves , and he simply made a general note , ( "Sand Sand ) waves , " as covering the section from mile 78 to 74 . ( R . 1260 . ) He never saw that phenomenon before . He ( will vnill ) describe it as he saw it there . In ( the tho ) first place , the sand waves as . noted ( were -were were ) always at points where the water was ( compara compara- compara ) ¬ tively swift , and by taking soundings with an oar they found the water was ( comparatively conaplaratively ) shallow . As they observed one of those places , the ( phenome phenome- phenome ) ¬ ( non noil ) ( seemed seenled ) to run through a rather distinct cycle . They would note that the surface of the water was very choppy , a series of little waves covering this , what might have been considered a very minor rapid point of swift ( water -water water ) with a very choppy ( sur- sur ) face . ( R . 1260 . ) Without apparent reason , or other warning , these waves , these chops , would ( sud- sud ) denly develop into a series of ( well-defined welldefined ) , ( smooth sniootli ) , undulatory waves . They differ from ocean waves in that the waves are comparatively stationary , while |