Mechanization, employment, and output per man in bituminous-coal mining.

Bibliographic Details
Corporate Author:	United States. Federal Works Agency
Format:	Government Document eBook
Language:	English
Published:	[Washington] : [s.n.], 1939.
Subjects:	Coal. Occupations. Technological innovations.
Online Access:	Electronic resource (PDF)

Description
Item Description:	Includes tables and illustrations.
Physical Description:	1 online resource (266 pages), digital, PDF file