What superintendent of coal mine might do to prevent injury from falls of roof.

Bibliographic Details
Other Authors: Paul, J. W. (James Washington)
Format: Government Document eBook
Language:English
Published: Washington, D.C. : [publisher not identified], 1930.
Series:Mines Bur. Info. Circ. No. 6345
Subjects:
Online Access:Connect to the full text of this electronic document

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