The Encyclopedia Americana: The International Reference Work, Volume 7Americana Corporation, 1960 - Encyclopedias and dictionaries |
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Page 156
... cent of its annual pro- duction from stripping , and a little over 40 per cent of West Germany's brown coal output is obtained from surface mines . The percentage of total annual production obtained by surface re- covery for other ...
... cent of its annual pro- duction from stripping , and a little over 40 per cent of West Germany's brown coal output is obtained from surface mines . The percentage of total annual production obtained by surface re- covery for other ...
Page 221
... cent and reduced the size and changed the metallic content of the cent . The composition of the cent was again changed in 1864 to 95 per cent copper and 5 per cent tin and zinc and its weight was further reduced to 48 grains . These ...
... cent and reduced the size and changed the metallic content of the cent . The composition of the cent was again changed in 1864 to 95 per cent copper and 5 per cent tin and zinc and its weight was further reduced to 48 grains . These ...
Page 652
... cent of the world's copper in 1916 , 48 per cent in 1929 , 36 per cent in 1943 , and 30 per cent in 1955. The large increase in copper production of Africa , Chile , and Canada is to be noted , and while the United States is still the ...
... cent of the world's copper in 1916 , 48 per cent in 1929 , 36 per cent in 1943 , and 30 per cent in 1955. The large increase in copper production of Africa , Chile , and Canada is to be noted , and while the United States is still the ...
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