The National Geographic Magazine, Volume 85National Geographic Society, 1944 - Geography Indexes kept up to date with supplements. |
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Page 569
... coal , which seems so com- monplace , is the prodigious servant that does the bulk of our work . It is the only substance of which there is enough available in the world at present to provide ... coals 569 Coal : Prodigious Worker for Man.
... coal , which seems so com- monplace , is the prodigious servant that does the bulk of our work . It is the only substance of which there is enough available in the world at present to provide ... coals 569 Coal : Prodigious Worker for Man.
Page 573
... coal ) , bituminous , and finally anthracite . A still later stage in the increasing percent- age of carbon is graph- ite , and at the very end of the cycle is ... Coal , Surface Miners Plow Level Indiana. Coal : Prodigious Worker for Man ...
... coal ) , bituminous , and finally anthracite . A still later stage in the increasing percent- age of carbon is graph- ite , and at the very end of the cycle is ... Coal , Surface Miners Plow Level Indiana. Coal : Prodigious Worker for Man ...
Page 578
... coal . Since then , by the use of coal , man has made iron his slave and by the use of iron has ruled the world . Coal and the Industrial Revolution It was not , however , until after the perfec- tion of the steam engine by James Watt that ...
... coal . Since then , by the use of coal , man has made iron his slave and by the use of iron has ruled the world . Coal and the Industrial Revolution It was not , however , until after the perfec- tion of the steam engine by James Watt that ...
Contents
Brazils Potent Weapons By W ROBERT MOORE | 41 |
Paricutín the Cornfield That Grew a Volcano Mexico By JAMES A GREEN | 129 |
Saboteur Mosquitoes By HARRY H STage | 165 |
Copyright | |
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