Update 39 for authority format is empty. I'm using this simply as a reminder that I didn't forget it. https://www.loc.gov/marc/authority/adapndxf.html MARC 21 FORMAT FOR AUTHORITY DATA FORMAT CHANGE LIST Update No. 39, December 2024 There are no changes to the MARC 21 Format for Authority Data for Update No. 39 (December 2024) resulting from proposals that were considered by the MARC 21 community since the publication of Update No. 38 (June 2024).