Appendix to the Legislative Journal Session of 1913
out a system of artificial support of the surface that would insure protection at a cost that would warrant such a plan to be put into operation. ... In some instances where extraordinary strength is required in the filling material, and at points that are easily .... be made with the purpose of determining the amount of filling necessary to prevent destructive la#39;upilifa#39;e of the strata, ... 1n my opinion complete support can only be attained by leaving sutiicient coal pillars properly protected. or theanbsp;...
| Title | : | Appendix to the Legislative Journal Session of 1913 |
| Author | : | |
| Publisher | : | - |
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