Follow these guidelines for newly-created authority records. Add a 781 field to an existing record when making any other change to it. If revising an existing record that contains a 667 field subject cataloging usage note indicating the proper geographic subdivision form, delete the 667 field and replace it with a 781 field. | Follow these guidelines for newly-created authority records. Add a 781 field to an existing record when making any other change to it. If revising an existing record that contains a 667 field subject cataloging usage note indicating the proper geographic subdivision form, delete the 667 field and replace it with a 781 field. |