The National Geographic Magazine, Volume 85National Geographic Society, 1944 - Geography Indexes kept up to date with supplements. |
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Page 48
... mines are being re - explored and opened for production to meet expanded war demands . Ever larger quantities are being rushed to Allied war factories . Digging Crystals in Minas Gerais I visited several of the Minas Gerais mines ...
... mines are being re - explored and opened for production to meet expanded war demands . Ever larger quantities are being rushed to Allied war factories . Digging Crystals in Minas Gerais I visited several of the Minas Gerais mines ...
Page 582
... mines by 80 percent ( page 587 ) . rock , and other foreign matter , smaller sizes of coal are frequently washed , or cleaned , by air or water ; larger sizes are picked over by hand to remove the im- purities and , if too large , they ...
... mines by 80 percent ( page 587 ) . rock , and other foreign matter , smaller sizes of coal are frequently washed , or cleaned , by air or water ; larger sizes are picked over by hand to remove the im- purities and , if too large , they ...
Page 587
... Mines in 1910 . The average deaths per million tons of coal mined were 4.76 in 1911-15 , but by 1936- 40 had fallen to 2.71 . The largest single mine disaster was on December 6 , 1907 , at Monon- gah , West Virginia , when 361 men were ...
... Mines in 1910 . The average deaths per million tons of coal mined were 4.76 in 1911-15 , but by 1936- 40 had fallen to 2.71 . The largest single mine disaster was on December 6 , 1907 , at Monon- gah , West Virginia , when 361 men were ...
Contents
Brazils Potent Weapons By W ROBERT MOORE | 41 |
Dominican Republic Land of Plenty 11 illustrations in color from naturalcolor photo | 209 |
Frontline Town of Britains Siege Dover By HARVEY KLEMMER 105 | 225 |
Copyright | |
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