http://purl.org/dc/elements/1.1/subject

used by 17:

• bibsonomy
• bootsnall
• chronicling-america
• hellenic-police
• indymedia
• isocat-metadata
• jugem
• lak-dataset
• ndaa2011
• open-library
• productontology
• randomnessguidelondon
• rism
• rkb-explorer-webconf
• sudocfr
• thesesfr
• wordpress