090  Locally Assigned LC-type Call Number (R)

Definition

Call numbers based on the Library of Congress (LC) classification schedules, but assigned locally. Field 090 is not part of the standard MARC 21 Bibliographic format.

Guidelines

If you are transcribing LC copy, use field 050 for the LC-assigned call number. Use field 055, field 060, or field 070 for call numbers based on LC classification schedules, but assigned by the Library and Archives Canada (LAC), the National Library of Medicine (NLM), or the National Agricultural Library (NAL).

Records may contain field 050 and field 090, but only if field 050 is a recognized word or phrase (e.g., PAR, Newspaper, UNC, or NOT IN LC). Field 090 is not retained in the WorldCat record if field 050 contains a call number. It is retained in exported records and records delivered via other services.

If you assign a Library of Congress classification number according to the LC class schedules, prefer field 050 with 1st indicator blank, 2nd indicator 4. If the classification portion of your number does not conform to the LC class schedules, use field 099.

Certain classification choices are recognized to be local decisions. Multiple call numbers in the same classification scheme in a WorldCat record may be appropriate under certain circumstances. For more information, see 050-099 Introduction to Call Numbers.

1st Indicator

Undefined. The 1st indicator position is undefined and contains a blank.

	Undefined

2nd Indicator

Undefined. The 2nd indicator position is undefined and contains a blank.

	Undefined

Subfields

Indexing

For indexing and searching information, see Searching WorldCat Indexes, field 090.

MARC 21

Field 090 is OCLC-defined and therefore not included in MARC 21 Format for Bibliographic Data.