The Encyclopedia Americana, Volume 7Grolier, 1989 - 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 436
... of the means changing relations of production caused by changes of production . in technical conditions . ... the means of cordance with needs , the state would cease to be production - patricians in Rome , feudal lords in an ...
... of the means changing relations of production caused by changes of production . in technical conditions . ... the means of cordance with needs , the state would cease to be production - patricians in Rome , feudal lords in an ...
Page 439
To the rives its power from private ownership of the extent that they still hold to Marxian ideas , the principal existing means of economic production . democratic socialists have revised them to fit mod- The discussion is designed to ...
To the rives its power from private ownership of the extent that they still hold to Marxian ideas , the principal existing means of economic production . democratic socialists have revised them to fit mod- The discussion is designed to ...
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