Field definition and scope:

Fields 090-099 are reserved for local call number use and local definition.  For interchange purposes, documentation of the structure of the 09X fields and input conventions must be provided to exchange partners by the organization initiating the interchange.

The National level record requirement for these fields is Optional.

Content designator history:

090 Shelf Location  (AM)  [obsolete]  [USMARC only]

091 Microfilm Shelf Location  (AM)  [obsolete]  [USMARC only]

Fields 090 and 091 were made obsolete in 1977.  Both indicator positions were undefined and only a subfield $a was defined in each field.

090 Local Call Number  [obsolete]

Field 090 was made obsolete when the entire 09X block of numbers was reserved for local use and definition in 1982.  Both indicators were undefined.  The subfield codes were:  $a (Local class number) and $b (Local Cutter number).

See also:

0XX  Numbers and Codes

Variable Data Fields