In T204484 we made a tool to download and process the Runeberg.org catalog. It produced this output, though it was a while ago so it should be run again :) To make sure we've ingested the newest additions.

Now let's use it to create Wikidata items for the missing books.

There are only 204 Wikidata items with Runeberg book ID. There's probably a small number of existing items where the ID can be added, but most of them will have to be created from scratch.