If you make it like collections we can create our own series. Otherwise you can likely do it similarly to how Calibre does it from Google Books: https://developers.google.com/books/docs/v1/using and Amazon: https://affiliate-program.amazon.com/gp/advertising/api/detail/main.html  Or since book and audiobook series tend to be the same look up the book series data via the overdrive metadata API: https://developer.overdrive.com/apis/metadata or the openlibrary's api: https://openlibrary.o
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