AACR2 Chapter 1‎ > ‎

1.2B4. Edition Statement. Optional Addition

LC practice: Do not apply this optional rule to any case of merely supposed differences in issues that might make them different editions. Apply the option for manifest differences where the catalog records would otherwise show exactly the same information in the areas beginning with the title and statement of responsibility area and ending with the series area.

LC/PCC practice for updating loose-leafs:
Apply the option if the main entry and/or title proper of a resource being cataloged would be the same as that of the resource it continues.