Untraced reference:
Code b (008/09) indicates that the 100-151 field contains an unestablished heading that is not authorized for use as the lead element in an access point in a bibliographic record. The heading is not traced as a 4XX See From Tracing field in any other authority record. The reference record contains a 260 (Complex See Reference) or a 666 (General Explanatory Reference) field to guide the user to established heading(s).
If an unestablished 15X heading may also be used as a subject subdivision,
code g
is used in 008/09 when an organization uses one authority record to convey this dual function.
When separate records are created,
code b is used for the untraced reference record, and
code d
is used for the subdivision record.
Example:
008/09 b
100 0#$aDe la
666 ##$aNames beginning with this prefix are also entered under La (e.g., La Bretèque, Pierre de) or under the name following the prefix (e.g., Torre, Marie de la)
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