Music Library Association Best Practices for thematic index number

Routinely record the element in authority records if used as a component of an authorized or variant access point. Record the element in other cases if readily ascertainable.

In bibliographic records: Record the element if deemed useful for identification or selection.

In MARC: Record as an identifier using field 383 subfield $c. Consult Thematic Indexes Used in Library of Congress NACO Authority Files ; if the index is listed there, also record the code assigned to the index in field 383 subfield $d and indicate the source of information using the $2 code mlati.

See examples in MARC format: thematic index number

Apply the option. Caption the number using the abbreviation specified in Thematic Indexes Used in Library of Congress NACO Authority Files .

Apply the option if the thematic index does not have an abbreviation defined in Thematic Indexes Used in Library of Congress NACO Authority Files and there is not another form of abbreviation defined in the index itself or in common use.

Apply the option if the thematic index does not have an abbreviation defined in Thematic Indexes Used in Library of Congress NACO Authority Files .