Question.....regarding android tablet and the Kindle ebook reader

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http://www.mobileread.com – I moved an ebook from Calibre to my Arnova tablet yesterday. It is listed in the Calibre library as being on my device BUT it is not on my tablet. I tried to sync in my Kindle menu but nothing. Any suggestions on what else that I might be able to do? Thanks, Patty (HowTos)