Unfortunately, not all the finding aids in APE (already) have a stable URL, due to the lack of an identifier in the data provided. To be sure to retrieve any finding aid what you want to save, please save the title of the item you’ve found and the archival institution where the finding aid came from, together with the URL - through the title, you will always be able to retrieve the content. If you need to retrieve an item for which you only have an unstable URL, please contact us and we should be able to help you out