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					Originally Posted by BeeTee-Ess  I attempted adding them using the Add books from directories, including sub-directories (Multiple books per...), but actual .ZIP files were added, each containing only the first book for each author. | 
	
 It is true calibre only handles 1 book inside a zip.  Unzip the directories to a temp location and add them using the 
Add books from directories, including sub-directories (one book per...) option.