Therefore, it is necessary to carry out monitoring and evaluation research on the risk of instability and disaster caused by the linkage of residual coal pillars and rock strata. The challenge of ...

Oils, bitumen and coal are not confined to the carboniferous, but are found in all the sedimentary strata older and later than the coal. I give a condensed tabular view of the various geological ...

The only difference seems to be that the Massachusetts coal field has undergone a change, occasioned by the action of the fire. The strata seem to have been subjected to lateral pressure ...