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Dan: Dan, thank you for your pertinent comments. I didn't mean to imply that 520 was to be used for additional _subject headings_, but since this is a summary field that is keyword indexed in many systems (not all systems index or recognize the uncontrolled fields you suggest), it would be a place to work those alternative words in so they can be found by patrons. Certainly the controlled subjects (600, 610, 611, 630, 650, 651, etc.) should ONLY be used for approved subject headings. I was taught that the 520 field was there to allow us some latitude in describing an item in a form that would be useful to patrons, and I take this to mean using terms that are in common usage but perhaps NOT approved subject headings. Hope this clears things up a bit! Mark Williams Librarian Colton High School Mark Williams Librarian Colton High School <mark_williams@eee.org>