The National Geographic Magazine, Volume 115National Geographic Society, 1959 - Geography Indexes kept up to date with supplements. |
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Page 302
... lake . They raised great bridges while traffic flowed over them without halt . They pumped raging rapids . dry and dredged mountains of muck and glacial till . And when they were finished , what had they produced ? To understand the ...
... lake . They raised great bridges while traffic flowed over them without halt . They pumped raging rapids . dry and dredged mountains of muck and glacial till . And when they were finished , what had they produced ? To understand the ...
Page 306
Duluth Soo Canals Elevation 602 feet Lake St. Clair Elevation 579 feet Lake Huron Elevation 572 feet Lake Erie Welland Canal Elev . 246 feet Sea Level Lake Ontari Lake Superior 90 ° Port Arthur CANADA U.S.A Duluth Superior Fort William ...
Duluth Soo Canals Elevation 602 feet Lake St. Clair Elevation 579 feet Lake Huron Elevation 572 feet Lake Erie Welland Canal Elev . 246 feet Sea Level Lake Ontari Lake Superior 90 ° Port Arthur CANADA U.S.A Duluth Superior Fort William ...
Page 480
... Lake Erie until this century , but by the late 1930's it had virtually exter- minated the lake trout of Huron and Michigan and was coming through the Soo into Lake Superior . A dozen years ago probably too late for the lake trout , but ...
... Lake Erie until this century , but by the late 1930's it had virtually exter- minated the lake trout of Huron and Michigan and was coming through the Soo into Lake Superior . A dozen years ago probably too late for the lake trout , but ...
Contents
A TROPICAL BIT OF FRANCE 255 | vi |
FIRST CROSSINGS OF THE ENDS OF THE EARTH | 1 |
THE ARCTIC AS A SEA ROUTE OF THE FUTURE | 21 |
Copyright | |
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