The National Geographic Magazine, Volume 104National Geographic Society, 1953 - Geography Indexes kept up to date with supplements. |
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Page 435
... caverns ( map , page 450 ) , is the capital of the United States potash industry . Its mines contribute 85 percent of the Nation's potash production . Down , Down , Down - 829 Feet " " " During my 19 years at the caverns , ' Colonel ...
... caverns ( map , page 450 ) , is the capital of the United States potash industry . Its mines contribute 85 percent of the Nation's potash production . Down , Down , Down - 829 Feet " " " During my 19 years at the caverns , ' Colonel ...
Page 438
... caverns , for the air changes natu- rally every 24 hours . Some , however , recalled having seen cave fog where warm air met cold . Except where cold drafts seep in , the caverns ' temperature remains a constant 56 ° F. , winter and ...
... caverns , for the air changes natu- rally every 24 hours . Some , however , recalled having seen cave fog where warm air met cold . Except where cold drafts seep in , the caverns ' temperature remains a constant 56 ° F. , winter and ...
Page 452
... caverns in a blinding , crucible glow for one - thirtieth of a second . When darkness reigned again , Helm closed the shutters . But the job was not ended ; every bit of debris had to be cleared from public sight . " Nothing seems ...
... caverns in a blinding , crucible glow for one - thirtieth of a second . When darkness reigned again , Helm closed the shutters . But the job was not ended ; every bit of debris had to be cleared from public sight . " Nothing seems ...
Contents
Return unatologHE NATIONAL | 1 |
The Ape with Friends in Washington | 61 |
Gloucester Blesses Its Portuguese Fleet | 75 |
Copyright | |
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