The National Geographic Magazine, Volume 115National Geographic Society, 1959 - Geography Indexes kept up to date with supplements. |
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Page 110
... deep sinkhole by the inhabitants of the old city . I have often dived to the sea bottom , but this was the first time I had ever dived through it . I was plunging into a hole in an ancient ocean bed that slowly emerged from the tepid ...
... deep sinkhole by the inhabitants of the old city . I have often dived to the sea bottom , but this was the first time I had ever dived through it . I was plunging into a hole in an ancient ocean bed that slowly emerged from the tepid ...
Page 117
... deep and stays too long or comes up too fast . When we moved down to the 80 - foot level and beyond , we had to keep close watch on our time below . Complications confront a free diver when he makes several deep dives in one day . Then ...
... deep and stays too long or comes up too fast . When we moved down to the 80 - foot level and beyond , we had to keep close watch on our time below . Complications confront a free diver when he makes several deep dives in one day . Then ...
Page 302
... deep , and though the cur- rent was swift , it flowed smooth and straight and was navigable even for sizable ships . The St. Lawrence has the most unvarying flow of any of the world's great streams . But in three stretches the river ...
... deep , and though the cur- rent was swift , it flowed smooth and straight and was navigable even for sizable ships . The St. Lawrence has the most unvarying flow of any of the world's great streams . But in three stretches the river ...
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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