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Timbering along the robbing line :factors influencing falls of roof in coal mines

Stop, look and listen! :the roof is going to fall

State laws relating to coal-mine timbering

Timbering regulations in certain coal mines of Pennsylvania, West Virginia, and Ohio

A study of falls of roof and coal in mines in the number 8 field of eastern Ohio

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

A study of falls of roof and coal in mines of Harrison County, West Virginia

A study of mine roof of the Pittsburgh coal bed in the Pittsburgh mining district

Timber withdrawing and devices used for this purpose in some coal mines


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