The National Geographic Magazine, Volume 82National Geographic Society, 1942 - Geography Indexes kept up to date with supplements. |
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Page 309
... important work in special fields . It is now engaged in physical research dealing with the ionosphere , of high importance to radio transmission and of particular usefulness in the present war- so important indeed that its details ...
... important work in special fields . It is now engaged in physical research dealing with the ionosphere , of high importance to radio transmission and of particular usefulness in the present war- so important indeed that its details ...
Page 537
South America's Wartime Importance TIS VIET HERVA - MAD MERKI STACK 2947 BRASIL FRRAS. TITH this issue of THE GEOGRAPHIC ... important . The Battle of Transport The map reveals the continent's geographic handicaps to road building . Vast ...
South America's Wartime Importance TIS VIET HERVA - MAD MERKI STACK 2947 BRASIL FRRAS. TITH this issue of THE GEOGRAPHIC ... important . The Battle of Transport The map reveals the continent's geographic handicaps to road building . Vast ...
Page 539
... importance is Brazil's supply of carbonado . These industrial diamonds , essentially pure carbon and the toughest substance known , have many important uses . With a carbonado die more than 300 tons of hot copper can be drawn into fine ...
... importance is Brazil's supply of carbonado . These industrial diamonds , essentially pure carbon and the toughest substance known , have many important uses . With a carbonado die more than 300 tons of hot copper can be drawn into fine ...
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