When it comes to the public domain books on kobobooks.com I saw 2 versions of most books, one would be in Kobo format with a cover while the other was ePub but without a cover. When you do a search on Kobobooks it will show ePub in the Available formats list if it is available, on the book details page it does also show icons would devices, the eReader option indicates ePub (if you click on More Info it mentions compatibility with both Kobo and Non-Kobo readers).
As PeterT says, it does vary by book although I would say most books are available in ePub format. Certainly not every book though, so if you do absolutely require ePub you will want to check every time.
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