Established heading and subdivision:
Code f (008/09) indicates that the 15X field contains an established general or chronological term or a geographic name heading that is also authorized for use as a subdivision in a subject access point in a bibliographic record. One authority record is used to describe this dual function. The record may also contain a reference note field that explains the dual function.
When separate authority records are created, code a is used for the established heading record and code d is used for the subdivision record. An 18X heading field is used in the subdivision record.
Examples:
008/09 f
150 ##$aChronology
360 ##$isubdivision$aChronology$ior$aHistory--Chronology$iunder names of persons, places, corporate bodies, sacred works, ethnic groups, and$aIndians of North America,$iand topical headings
008/09 f
151 ##$aGreat Lakes
680 ##$iThis term is to be used only as a geographic descriptor and may not be subdivided. It may, however, be used to subdivide topical indexing terms.
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