First and Second indicators:

#  Undefined


a  CONSER variable field note (R)


Field 936 is used in AACR2 records for the following:

1.   To note the expected date of publication for prepublication records (042 = nsdp).

2.   To identify authenticated records reported for deletion to a Center of Responsibility and duplicate records reported to OCLC for deletion.

3.   To identify the CONSER institution that converted an LC-authenticated pre-AACR2 record to AACR2.

4.   As a method of storing the OCLC number of parallel language record numbers.

5.   To identify records involved in a cleanup project.

Former practice:

Prior to the implementation of the 2002 AACR2 rule revisions, field 936 was used in AACR2 records to express the latest issue consulted when cataloging the title or updating the record.  When used to specify the latest issue consulted, the 936 field was distinguished from earlier application of the field by the addition of the abbreviation "LIC" following the volume number and date of the issue.

936 ## Vol. 5, no. 22 (Apr. 1984) LIC

With the implementation of the 2002 rule revisions, the "latest issue consulted" note was input into a 500 (General Note) field until field 588 (Source of Description Note) became available in 2010.  CONSER catalogers now input this information in field 588.

For information on how field 936 was used in pre-AACR2 records see the section relating to that topic below.

Editing instructions

Separate multiple 936 statements with a semicolon and input subfield $a before each subsequent statement.

936 ## AACR2=IUL $a Not related to serial with the same title also published in New Brunswick in the 1940s [NYG]

1.   US ISSN Center use of field 936 of prepublication records

The US ISSN Center enters records for serials prior to publication when a publisher requests an International Standard Serial Number (ISSN).  Field 936 is given in prepublication records to record the expected date of publication.

936 ## PREPUB: Publication expected Dec. 1984

The US ISSN Center updates these records upon receipt of follow-up information from the publisher.  CONSER members wishing to update these records must follow the procedures given in C6.1.

2.   Reporting records for deletion

When a CONSER cataloger consolidates multiple records and one or more of the records to be deleted has been authenticated, the cataloger must request that the Library of Congress delete the superfluous records (see also C8).  To notify others that the records are no longer to be used, input a note in field 936:


Field 936 is also used when a duplicate record is reported to OCLC for deletion.  If there is already information given in field 936, delete the other information.  Duplicates can be reported by using the drop down menu under "Action," "Report error" in the OCLC Connexion interface or through the online WorldCat Duplicate Record Merge Request form available at

3.   Noting conversion to AACR2

When a cataloger converts an LC-authenticated pre-AACR2 record to AACR2, the 042 code of "lc" and the 010 control number are not changed.  The cataloger, instead, adds the cataloging institution's symbol following "AACR2=" in field 936.

936 ## AACR2=GUA

936 ## AACR2=DLC

4.   OCLC number of parallel language records

N.B.  Before OCLC's policy change, records for the same title, but cataloged in different languages, such as English, Spanish, and French were considered duplicate records in OCLC.  OCLC no longer considers these records duplicates, but allows them as parallel records.  The language of cataloging in CONSER records however, is still English.  The only allowable parallel language records in the CONSER file are the LAC French/English records (see CEG C7.2.7).

Parallel language records may be identified in the 936 field.  Catalogers may notice records in other languages of cataloging at the time of inputting a new record and can follow the procedures below for noting them on the new record.

Input the OCLC control number of the parallel record preceded by the uppercase letters PR and a space.

936 ## PR 60492296

If there are two or more parallel record, the cataloger may input the OCLC numbers for the subsequent parallel records in the same 936 field with a space between each OCLC number.

936 ## PR 45570484 45825482

To learn about parallel record structure within WorldCat see OCLC Technical Bulletin 250: Parallel Records [].

5.   Noting conversion from ELvl 4

CONSER stopped using encoding level "4" in 2007 after implementing CONSER standard record guidelines.  All CONSER standard records now use encoding level "blank."  An automated conversion project replaced the encoding level "4" formerly used in CONSER core level records to "blank" and noted that this process has taken place in field 936.

936 ## Converted from ELvl 4 (OCLC)

Pre-AACR2 use of field 936

Under pre-AACR2 CONSER practice, field 936 was used to record the latest issue consulted (on which the cataloging was based) or to note the fact that no issue was consulted.  Early projects that converted manual records to machine-readable records often did not know which issues, if any, were consulted for the original cataloging.  The designations "Unknown" and/or "INC" (Issue not consulted) were used in this field.

936 ## INC

In some cooperative conversion efforts, title pages were reproduced and sent to a central conversion unit with the resulting designation in the 936 field.

936 ## Nr. 28 (surrogate)

The instructions listed below should be followed when updating a pre-AACR2 record.

1)   If there is no 936 field in the updated record, input the field adding as the first subfield $a "Unknown."  Add a second subfield $a with the designation of the latest issue consulted.

2)   If the 936 field is already in the record with two subfields $a, overwrite the second with the designation of the latest issue consulted.

3)   If the 936 field is present with only one subfield $a, add a second with the designation of the latest issue consulted.

4)   If a 362 field (indicator "0") is added with the designation of the last issue, then delete the 936 field, if present.

5)   Do not add "LIC" to the 936 field of pre-AACR2 records.

AACR2 cataloging is based on the earliest issue, which is noted in the 588 field, and on an issue in hand.  Therefore, the above uses for the 936 field are only applicable when updating the pre-AACR2 records.  If the record is converted to AACR2, cataloger would use 588.


Field 936 is output by OCLC to LC but is not distributed by LC.

Related fields, etc.

B, C8, C9, 008/18, 037, 260, 263, 310, 350 [Obsolete], 500, 550, 588

See also:

9XX  Local Copy Information

Variable Data Fields

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

CONSER Editing Guide:  Contents