This app was mentioned in 4 comments, with an average of 1.50 upvotes
I read them with ebook reader . it work especially good with epub and mobi file
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you will need to install some ebook reader app.
https://play.google.com/store/apps/details?id=com.ebooks.ebookreader
If you have a phone/tablet you could use that, i downloaded a free app that was pretty good for ebooks:
https://play.google.com/store/apps/details?id=com.ebooks.ebookreader