 Thus , Innis travelled extensively beginning in the summer of 1924 when he and a friend paddled an 18 @-@ foot ( 5 @.@ 5 m ) canvas @-@ covered canoe hundreds of miles down the Peace River to Lake Athabasca ; then down the Slave River to Great Slave Lake . They completed their journey down the Mackenzie , Canada 's longest river , to the Arctic Ocean on a small Hudson 's Bay Company tug . During his travels , Innis supplemented his fur research by gathering information on other staple products such as lumber , pulp and paper , minerals , grain and fish . He travelled so extensively that by the early 1940s , he had visited every part of Canada except for the Western Arctic and the east side of Hudson Bay . 
 Thus , Innis <a href='uninflect' title='1'><mark>travelled</mark></a> extensively beginning in the summer of 1924 when he and a friend paddled an 18 @-@ foot ( 5 @.@ 5 m ) canvas @-@ covered canoe hundreds of miles down the Peace River to Lake Athabasca ; then down the Slave River to Great Slave Lake . They completed their journey down the Mackenzie , Canada <a href='null_genetive' title='2'><mark>'s</mark></a>longest river , to the Arctic Ocean on a small Hudson <a href='null_genetive' title='3'><mark>'s</mark></a>Bay Company tug . During his travels , Innis supplemented his fur research by gathering information on other staple products such as lumber , pulp and paper , minerals , grain and fish . He <a href='uninflect' title='4'><mark>travelled</mark></a> so extensively that by the early 1940s , he <a href='been_done' title='5'><mark>had</mark></a> visited every part of Canada except for the Western Arctic and the east side of Hudson Bay . 
Thus , Innis traveled extensively beginning in da summer of 1924 when he and a friend paddled an 18 @-@ foot ( 5 @.@ 5 m ) canvas @-@ covered canoe hundreds of miles down the Peace River to Lake Athabasca ; then dwn the Slave River to Great Slave Lake . They completed their journey down the Mackenzie , Canada  longest river , to the Arctic Ocean on a small Hudson  Bay Company tug . During his travels , Innis supplemented his fur research by gathering information on other staple products such as lumber , pulp and paper , minerals , grain and fish . He traveled so extensively that by the early 1940s , he done visited every part of Canada except for tdaWestern Arctic and the east side of Hudson Bay .