Hi Chris, I'm pretty sure there is an option in the endnote library (whatever version your'e using) tools menu that says "remove duplicates". However this will only work if the duplicates are EXACTLY the same (IE - no extra full stops, hyphens, etc). If they've appeared due the the reasons you suggest, there's no reason why they shouldn't be identical. Once you've selected that option, it will highlight all the duplicated records and give you an option to delete.