http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
Identifying opportunities for methane recovery at U.S. coal mines
profiles of selected gassy underground coal mines 1999-2003
Opportunities for methane recovery at U.S. coal mines
Profles of selected gassy underground coal mines
Title from title screen (viewed May 9, 2007).
Mode of access: Internet from the EPA web site. Address as of 5/09/2007: http://www.epa.gov/cmop/pdf/profiles%5F2003%5Ffinal.pdf; current access is available via PURL.