Originally Posted by steve_bham
Thanks for info. I have cc as well, if I use that way will it stop aving duplicate books on the device ?
I'm sure calibre is sending only one copy of any book to your Nexus 7. I suspect that when you add the books to the reader app, that the reader app creates the duplicate books. I no longer ever add my books to a reader app I simply use Calibre Companion to open the book in my favorite reader.