Browse TRAIL Inventories

Method and cost of mining the Upper and Lower Freeports and the Lower Kittanning coal in a group of mines in Western Central Pennsylvania

Method and cost of mining the Pittsburgh, or no. 8, coal bed in four eastern Ohio mines

Reducing accidents from falls of roof in coal mines

Roof support in coal mines in the Irwin, Greensburg and Latrobe Basins, Westmoreland County, Pa.


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