The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 137
... Mines . Mines may be classified by the method of entry into the coal seams . Where coal lies close enough to the surface and the costs of removing the overlying material are sufficiently low to permit a profit to be made , the coal is ...
... Mines . Mines may be classified by the method of entry into the coal seams . Where coal lies close enough to the surface and the costs of removing the overlying material are sufficiently low to permit a profit to be made , the coal is ...
Page 139
... mines decreased from the previous year by 14 % . There were 216 fatalities , of which 187 oc- curred underground , 13 on the surface , 15 at strip mines , and 1 at an auger mine . Three gen- eral types of accidents caused 89 % of the ...
... mines decreased from the previous year by 14 % . There were 216 fatalities , of which 187 oc- curred underground , 13 on the surface , 15 at strip mines , and 1 at an auger mine . Three gen- eral types of accidents caused 89 % of the ...
Page 141
... mines for use of parent companies . Steel companies account for most of the captive production , but some electric utili- ties and a few chemical plants operate mines . Captive production in steel companies represents about 60 % of that ...
... mines for use of parent companies . Steel companies account for most of the captive production , but some electric utili- ties and a few chemical plants operate mines . Captive production in steel companies represents about 60 % of that ...
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19th century Africa American Atlantic cod became Bogotá born Britain British church civil Clark Clay Cleisthenes Cleveland climate clocks cloture cloud clubs coal coal tar coeducation coelacanth coffee coinage coins coke College Colombia colonies color Colorado Columbia Columbus comets comic commercial common cold common law Commonwealth COMMONWEALTH OF NATIONS Communist countries courts developed died early East economic elected Empire England English established European example federal France French higher education important India Indian industry institutions Island John known land later latitudes London major ment meters miles montmorillonite Mountains Museum National North Ocean organization party period plants political Population president produced programs region River Roman social South Soviet Soviet Union species temperature tion trade treaty Union United University usually West western World World War II York
Bibliographic information
| Title | The Encyclopedia Americana, Volume 7 The Encyclopedia Americana, ISBN 0717201155, 9780717201150 |
| Publisher | Grolier, 1985 |
| ISBN | 0717201163, 9780717201167 |
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