The National Geographic Magazine, Volume 91National Geographic Society, 1947 - Geography Indexes kept up to date with supplements. |
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Page 313
America a new kind of vacuum tube , the It magnetron , which they had developed . Scientist's Dream Helps Win the War was a new , powerful generator to produce One night this scientist had a dream . In short waves that would bring back ...
America a new kind of vacuum tube , the It magnetron , which they had developed . Scientist's Dream Helps Win the War was a new , powerful generator to produce One night this scientist had a dream . In short waves that would bring back ...
Page 316
Bell scien- weapons that during the war the Laboratories tists developed a soft rubber pad for the ear- became , next to Uncle Sam , the Nation's pieces of telephone headsets which fitted largest book publisher in number of titles ...
Bell scien- weapons that during the war the Laboratories tists developed a soft rubber pad for the ear- became , next to Uncle Sam , the Nation's pieces of telephone headsets which fitted largest book publisher in number of titles ...
Page 591
The once - sluggish streams were During this epoch the climate was sub- quickened and began to scour their channels tropical , and an abundant rainfall brought deeper . Many new tributaries developed , and ...
The once - sluggish streams were During this epoch the climate was sub- quickened and began to scour their channels tropical , and an abundant rainfall brought deeper . Many new tributaries developed , and ...
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Contents
Hunting Folk Songs in the Hebrides By Margaret Shaw Campbell | 249 |
Become a Bakhtiari By Paul Edward Case a | 325 |
In Manchuria Now By W Robert Moore | 389 |
Copyright | |
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