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I just converted over 300 ebooks some free from amazon.com and some purchased now I have over 1,000 files since I converted them. I have these files EPUB, JPG, and OPF Document. Do I need to keep all 3 to be able to read the ebooks on my tablet. I moved all the files to my tablet already. But do I keep all 3 files or just the main EPUB file.
Odd question I know but just wondering.
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