http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
McGraw-Hill's National Electrical Code 2011 handbook
1 online resource(xix, 1642 pages) : illustrations.
Brian J. McPartland, Frederic P. Hartwell, Joseph F. McPartland.
"Based on the current 2011 National Electrical Safety Code."