The Encyclopedia Americana, Volume 7Grolier, 1985 - Encyclopedias and dictionaries |
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Page 138
Where roof support is required ( as is often the case in weak shale ) , the overhead rock may be held in place by timber props , rock bolts , or other means . Artificial support is limited where possible to permanent openings .
Where roof support is required ( as is often the case in weak shale ) , the overhead rock may be held in place by timber props , rock bolts , or other means . Artificial support is limited where possible to permanent openings .
Page 222
BURGESS H. JENNINGS , Northwestern University COLD WAR , the conflict between the Communist nations led by the Soviet Union and the Western nations led by the United States , fought by all means - ideological , economic , political ...
BURGESS H. JENNINGS , Northwestern University COLD WAR , the conflict between the Communist nations led by the Soviet Union and the Western nations led by the United States , fought by all means - ideological , economic , political ...
Page 436
... again according to the theory , each economic system had an exploit- ing class that owned or controlled the means of production - patricians in Rome , feudal lords in medieval times , the bourgeoisie ( employers and property owners ) ...
... again according to the theory , each economic system had an exploit- ing class that owned or controlled the means of production - patricians in Rome , feudal lords in medieval times , the bourgeoisie ( employers and property owners ) ...
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