OCLC uses field 029 for system control numbers for records from non-OCLC automated systems (e.g., Library and Archives Canada, the British Library, WorldCat Cataloging Partners vendors, etc.). OCLC uses these numbers to process and track records from other systems.
1st Indicator
The type of system control number. Whether the other system control number is primary or secondary.
0
Primary control number
1
Secondary control number
2nd Indicator
Blank. The 2nd indicator position is undefined and contains a blank ( ).
Undefined
Subfields
‡a OCLC library identifier
The library from which the non-OCLC system number is generated.
‡b System control number
The entire number.
‡c OAI set name
For CONTENTdm-based items, enter the collection alias. For other digital items, enter the OAI set name.
‡t Content type identifier
Identifies the type of CONTENTdm collection or item or other type of digital collection or item. Use the following codes.