9xx Fields - OCLC
https://www.oclc.org/bibformats/en/9xx.html
WEBMar 14, 2024 · 9xx fields are not part of the standard MARC 21 format. OCLC has defined these 9xx fields for use by the Library of Congress and for internal OCLC use: 936, 938, 956, 987, 989, and 994. Fields 901-907, 910, and 945-949 have been defined by OCLC for your local use and will pass OCLC validation.
DA: 38 PA: 5 MOZ Rank: 80