http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Phasing out CSE Corporation SR-100 self-contained self-rescuers and enforcement
Title from subject line (viewed on May 3, 2013).
"Effective Date: 07/26/2012, Expiration Date: 03/31/2014."
United States. Mine Safety and Health Administration.
Procedure instruction letter ; no. I12-V-18