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|Material Type:||Document, Government publication, National government publication, Internet resource|
|Document Type:||Internet Resource, Computer File|
|All Authors / Contributors:||United States. Mine Safety and Health Administration,|
|Notes:||Title from subject line (viewed on July 16, 2013).
"Effective Date: 05/22/2012, Expiration Date: 03/31/2014."
|Description:||1 online resource (2 pages).|
|Series Title:||Procedure instruction letter, no. I12-V-16.|
|Other Titles:||Measuring methane levels at underground coal mines using belt air to ventilate working sections|