Working through the relationship between MARC, ISO 639-2, and ISO 639-3 language codes, MARC language names and their relationship (or not) to submitting LC subject heading proposals for language names, and how that all applies to using the optional MARC field 377, “Associated Language”, in the RDA context when creating or updating LC name authority records. And then a little musing about “to what end.” Examples of personal name authority files incorporating Associated Language are provided.
Update (2/22/21): OCLC is getting ready now to implement validation of the 377 field for ISO 639-3:
Cataloging Africana 