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					Originally Posted by  oddvision
					 
				 
				Pretty much the only managing I've done in Windows Explorer is to add the books I got from the Baen free library (or that I purchased from their website)... I just noticed the multiple copies when looking through the folder to make sure the new book copied into the Kindle documents folder. 
 
A few times I had a book tell me that it had problems and I had to redownload it form Amazon which I did with no issues. This is the first time I've had this issue with a book that I got from Baen, and it seems to have frozen the entire thing... 
			
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 Can you tell me the steps you took to get the books into calibre?
When you say you have 5 copies of the same book in calibre, but not on the Kindle, it makes me wonder if you imported from the Kindle's documents directory (as opposed to the steps I gave at 10:09) and accidentally imported some accessory files (like .mbp) as books... Such a file would show a title, but no author name or other metadata.