The National Geographic Magazine, Volume 82National Geographic Society, 1942 - Geography Indexes kept up to date with supplements. |
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Page 665
... radio . Sun- spots , breaking out on the sun's face , cause " magnetic storms " on earth so severe that at times all short - wave radio fades completely , and wire and cable messages are garbled . Sunspots May Lose a Battle To It is ...
... radio . Sun- spots , breaking out on the sun's face , cause " magnetic storms " on earth so severe that at times all short - wave radio fades completely , and wire and cable messages are garbled . Sunspots May Lose a Battle To It is ...
Page 673
... RADIO PHOTO COMMUNICATIONS INC By Radio , a Chinese Teaches English to Latin Americans ! Miss Pin Pin T'an , of the World Radio University in New York , broadcasts lessons in Basic English , a simplified form of the language , to ...
... RADIO PHOTO COMMUNICATIONS INC By Radio , a Chinese Teaches English to Latin Americans ! Miss Pin Pin T'an , of the World Radio University in New York , broadcasts lessons in Basic English , a simplified form of the language , to ...
Page 689
... Radio Science Radio dots and dashes , " beep , beep- ing " shrilly across thousands of miles of ocean , have revolution- ized naval war . From Washington the Navy Department today can . send messages direct to its ships anywhere . Three ...
... Radio Science Radio dots and dashes , " beep , beep- ing " shrilly across thousands of miles of ocean , have revolution- ized naval war . From Washington the Navy Department today can . send messages direct to its ships anywhere . Three ...
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