Series: Local Treatment LOCAL SERIES TREATMENT [minutes, 12/12/89]. Local series treatment decisions will be recorded on series authority records in the IO authority file. The pattern specified for local treatment information in NOTIS user documentation will be followed, except that IO processing unit codes, rather than NUC symbols, will be used to specify which libraries follow a given treatment. Each cataloging agency is encouraged to record local treatment, even if that treatment is the same as LC's. Several processing units may record their local treatment in the same local information field, but each cataloging agency is encouraged to create a separate field for the processing units for which it is responsible. IT IS CRUCIAL THAT NO CATALOGING AGENCY DESTROY LOCAL TREATMENT INFORMATION WHILE OVERLAYING A SERIES AUTHORITY RECORD. If a cataloging agency wishes to record updated series authority information from LC in an IO authority record, the cataloging agency must EITHER add the updated LC information by manual edit, OR the cataloging agency must copy all the local treatment information, overlay the series record, fix the heading use codes, if necessary, and recopy the local treatment information into the updated IO authority record. NOTE: The format for 670 field source citation will not be prescribed in IO.