Optional Definition Use for topical subject added entries and other subject added entries not defined in fields 600-630 or 651. Use for a topical subject entry assigned to a item by any agency but based on LC, AC, NLM, NAL, NLC, or Sears authorities. Use also for subject entries actually assigned by LC, NLM, NAL, or NLC that you are transcribing from cataloging copy.
First indicator Indicates whether the subject term is primary or secondary.
No level specified. Indicates that the level could be determined but is not specified. A subject covers the main content of the material. A subject covers the less important content of the material. A topical subject or geographic name used as an entry element for a topical term.