Record(s) being consulted or adapted for cataloging may contain subject analysis on which to build. Sometimes, however, the subject headings or classification numbers found on these records have been assigned from a different vocabulary or scheme. For example, NSDP assigns a broad Dewey number (field 082) on records that may not otherwise contain indications of subject content. The subject of the serial can be derived by consulting the Dewey classification schedule. When subject headings from other vocabularies are available (e.g., MeSH) the heading could be searched against a bibliographic database, when possible, and the retrieved records examined for appropriate equivalent headings from the vocabulary that is used.

See also:

15.4. Strategies for streamlining subject analysis