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Show 90-3 the positions of rapids superimposed on them were , placed there by him after carefully reading over his personal notes , and from his recollection . . ( R . . 3745 . ) These niaps would conform essentially to the maps appearing in Water Supply Paper No . . 538 , , ( Compl Con1pl' Con1pl ) . Exh . . No . 56 . He has mentioned all of the rapids , but he has not , enumerated quite all the difficulties . ( R . 3746 . ) At Mile 77.5 there was a portage . Then one of the . boats was cracked in the rapid at about 82.8 . . And then there was some water in the second Narrows . . ( R . 3747 . ) Between 104 and 106 , Christensen , Loper , and lie started out from camp about 7.30 a . m . , and followed one of these ( talus-covered taluscovered ) benches to a point about two and a half miles below the place where we started . The further they went , the higher the bench rose above the stream , and also the further they went , the chances of getting down to the stream became so slight that they returned . The three of them started down the river in the boat at 11.30 a . m . , , reaching destination about 45 minutes later but not without mishap . It all happened this way : From the camp Luke headed up to the left bank to avoid the swift water and to reach clear water . When they reached a certain place named ( 40-Ay 40Ay ) it became necessary to cross the strearn to avoid swift water on the left bank . When they approached the middle , and were going toward the shore , sand waves began to form . They got higher and higher , |