First and Second indicators:

#  Undefined


a  Overseas acquisition number (R)

8  Field link and sequence number (R)

NOTE:  See MARC 21 Format for Bibliographic Data (025 Overseas Acquisition Number) for code definitions not given below.


Field 025 is primarily used to record accession numbers which are used with Asian materials acquired by the Library of Congress's offices in New Delhi and Islamabad.  These numbers consist of codes for country and language followed by an accession number.  Use of these numbers began in October 1984.

The field was formerly used for numbers assigned by LC to works acquired through a number of overseas acquisitions programs.  The field contained the acquisition source of the item and also identified certain programs under which materials were acquired at LC.

Editing instructions

1.   Do not add a period at the end of the field.

2.   Add spaces only before and after $a when the subfield is repeated.


$a  Overseas acquisition number.

Subfield $a contains the overseas acquisition number.  Subfield $a is repeatable for recording multiple numbers associated with the same item.

025 ## I-D-E-2505

025 ## ET-E-123

025 ## PL480:I-D-E-334

Related fields, etc.

025 Overseas Acquisition Number  (MARC 21 Format for Bibliographic Data)

See also:

01X-09X  Numbers and Codes

Variable Data Fields

Section E.  MARC 21 Format for Serials as Applied Within CONSER

CONSER Editing Guide:  Contents