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The 040 field is designated for providing the name of the organization(s) that created the original record, assigned MARC content designation and transcribed the record into machine-readable form or modified an existing MARC record. Every agency that creates records has a designated 3 letter code, which is identified in subfield a. A 3 letter language code, used in subfield b, is used to specify the language in which the material is cataloged, if there is no “ǂb eng” then add it. Subfield c shows the agency that input the record into a shared cataloging system. The same 3 letter code assigned to agencies is used and is usually the same agency that created the record. The most common agency code you will see is DLC (which is the Library of Congress). The most important thing to know about this field is that it is different in AACR2 than it is in RDA (a subfield e = “rda” must be used to show that RDA rules were used to create the record. So, if the record is RDA and there is a 040 without the subfield e of “rda” it needs to be added.
AACR2: RDA:
040 ǂa DLC ǂb eng ǂc DLC 040 ǂa DLC ǂb eng ǂe rda ǂc DLC
040 ǂa UUS ǂb eng ǂc UUS 040 ǂa UUS ǂb eng ǂe rda ǂc UUS
041 Language Field
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When making changes to a DLC assigned call number (050 00), retain the original 050 and put the new call number in a 090.
050 00 M1500.B827 ǂb B54 1985
090 M1500.B837 ǂb B54 1985(adjusted author cutter)