Falls of roof in mines operating in the Pittsburgh coal bed, West Virginia.

Creator Personal:

Geyer, John Nicholas, 1896-, Paul, James Washington.

Title:

Falls of roof in mines operating in the Pittsburgh coal bed, West Virginia.

Call Number:

P3216

Date:

1933

Description:

Government document. Issued as: United States. Department of Commerce. Bureau of Mines. Technical paper, 547.

Subject Topical:

Coal mine accidents., Coal mines and mining--West Virginia.