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Pluggin works wonders and will find all your duplicates is you work through it stage by stage, but when you find you have several hundred duplicates it can be a bore working your way through them.
This proceedure is hairy but it works if all your books are one format.
Find all your dupicates, Title and Author, once they are found, select them all, ctrl A, and save them to a single folder, then delete all the selected books using Calibre delete selected.
Close Calibre
Now goto the folder you saved all the duplicates in and you will see (example)
Mansfield Park - Jane Austin.epub
Mansfield Park - Jane Austin(1).epub
(or .mobi or .azw3 etc)
Now search for all the the duplicates
name:~"*(1).epub" or .mobi, etc
select them all, ctrl A and delete them
If you have serverla copies of the same books you may have to repeat the search
name:~"*(2).epub" delete them
name:~"*(3).epub" delete them
Utill the search does not find any more books.
Now
Re-open Calibre, point the auto add function to the folder with all the remaining books in after the dublicates have been removed, (Preferences, Import/Export, Adding Books, Automatic adding, specify a folder)
Calibre will add your books books back into the libary
Job done
Unfortunately, similar, titles, similar authors etc still have to be done by hand
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