Miners' Safety and Health Almanac for 1920

Author:	Williams, Ralph C.
Year:	1919
Document Type:	N/A
Series:	Miners' circular (United States. Bureau of Mines)
Subjects:	Miners -- Health and hygiene -- United States.
	Mine sanitation -- United States.
	Mine safety -- United States.
Link:	https://digital.library.unt.edu/ark:/67531/metadc40305/