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This below edition of Dune is two parts Dune I and Dune II by the same Isbn
How can i split the edition to show that its two books not only one or it can't be done?

The two books have the same info and translator
1st part 506 pages and 2nd is 500 pages

/book/show/5...

Hi there, we appreciate your patience as we work through the tremendous backlog. I've added the book, you can find it here: Check this to see which folder you need for which type of request: /topic/show/...
How can you change the folder?
1. Click on the tiny "edit"-button at the right of the topic's title (only available for desktop/laptop, not in the app)
2. Change the folder to the folder you need
3. Don't forget to click on "SAVE"

Also please share a link, so that we can validate the information you shared. We need a webpage showing the (ISBN/ASIN and other) book data, not just the cover. We also need it for the cover image. It should be non-bookseller site (Amazon & AbeBooks excepted), so from the publisher, library or another acceptable site:
Alternatively, if you have the book, we can use a scan/photo of your copy for the cover and the page with the publication information (you can upload a scan/photo of your own to the "more photos..." section of your profile (/photo/new)), then copy the link here and a librarian can add it. Make sure you state the source of the photo in the text and that your account settings are public (not private).

This is a translation of Dune #1, the book is split into two volumes for convenience which is not uncommon in books including novels, that's why they have the same ISBN. It's a single book