Field definition and scope:

The 090-099 fields are reserved for a locally assigned call number for a series when all or part of the series is classified as a collected set or with the main series (646 Series Classification Practice, subfield $a, code c or m). For interchange purposes, the practices used in fields 09X should be known by parties involved in the interchange.

The National level record requirement for these fields is Optional.

Content designator history:

090 - Local Call Number  [obsolete]:  Field 090 was made obsolete in all MARC specifications when the entire 09X block of numbers was reserved for local use and definition in 1982.  Prior to that change, the field was defined for series call numbers.  In USMARC, both indicators were undefined.  In CAN/MARC, the first indicator values were:  0 (Current call number) and 1 (Earlier call number).  The subfield codes were:  $a (Classification number), $b (Item number), and $d (Volumes/dates to which call number applies).

LC Guidelines:

 090  Local Call Number

Related MARC field or document:

646  Series Classification Practice

See also:

0XX  Numbers and Codes

Variable Data Fields