If by multiple format you are talking about epub, mobi & pdf formats, that where I merge them. For example I have some books that I purchased from Fictionwize in PDB (Palm ereader format), that I later downloaded again from Barnes & Noble in ePub Format and again from Amazon when bookbub had a great deal on them just to make sure I could always find a copy I'm able to read on my current device. I have them all merged into a single entry where the "Formats" column displays AZW3, EPUB, PDB to indicate the diferent file formats attached to that entry in my library
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