COMARC/A | March | 2018 |
This field contains the UDC number associated with an authorized access point.
The edition of UDC schedules from which the number in subfield a is taken.
The number is taken from the version of the UDC schedules used by the agency preparing the record. UDC schedules are produced in various language versions and are revised from time to time. Each published edition of UDC is derived from the UDC Consortium's Master Reference File.