TKR is a special nonMarc format tag used in Aleph by staff to record information that may be useful in catalog management and statistics. There were over 25 million in the 11 separate SUL databases. After discussion it was decided to do some cleanup on TKR fields, eliminating those that weren't necessary and for FCLA to write a program to move TKRs to the first HOLdings record. TKR has been added to the indexes from the HOL records.
Reports are available to identify the number of TKRs by the first 15 characters. https://docs.google.com/spreadsheet/ccc?key=0AqWQ7uS92xFRdGdhRTc0amVBVnVDZ09qc1NPTVVCX3c#gid=0