With the June 1 Connexion install, LCCNs found in the 667 fields of newly added and changed authority records are included in the Connexion LCCN index.  This was accomplished by using changes made to the LCCN indexing functionality to scan the 667 field for the word: "Undifferentiated" (allowing for both upper and lower case).  If the word “undifferentiated” is identified in a 667 field, the software will then look for an LCCN in the 667 field and updates applied to the LCCN index.  An example of the indexing changes can be seen using LCCN no95033823.

Records containing LCCNs in 667 fields will automatically be included in all LCCN retrieval results and cannot be excluded when searching.  Please note, no textual data from the 667 field is indexed, rather, the word ‘undifferentiated’ is only used by internal processes to identify candidate records. 

No verification was done between LCCNs found in 667 fields and the 010 fields; if an LCCN in a 667 field contains a typographical error, please feel free to contact OCLC's Quality Control staff (authfile@oclc.org) requesting corrective action.

SEARCHING

The same searching guidelines are applicable to searching LCCNs in 667 fields that are noted for searching LCCNs found in 010 fields.  These are:

• Type year portion (2 or 4 digits) and control number, with or without the hyphen.
• Leading zeros in the control number portion are optional.
• Alphabetic prefix is optional to increase precision.
  
  78-5201 or 785201
  2001-12345 or 200112345
  82-000012 or 82000012
  82-12 or 8212
  n85-204041 or n85204041
  sh85-61704 or sh8561704

INPUTTING 667 fields

Because the 667 field is a text field, it would be helpful to ensure the following formatting was employed when adding LCCNs in 667 fields. 

• Type year portion (2 or 4 digits) and control number, with no hyphen. 
• n  85204041 (two digit year + 1 character prefix: add two spaces following the 'n' prefix)
• nr 99012578 (two digit year + 2 character prefix: add one space following the 'nr' prefix)
• no2007016671 (four digit year + 2 character prefix: add zero spaces following the 'no' prefix)
• n 2005035179 (four digit year + 1 character prefix: add one space following the 'n' prefix)