Quote:
Originally Posted by theducks
1) Select the Destination entry FIRST, then select additional entries. M (for merge with delete) or Right-click for more options.
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That's the manual merge method, which is usually the best. OTOH, if he has lots of these duplicates and all have approximately the same metadata, another option is to do it automatically. To do that he can turn on the autosort/automerge option in Export/Import|Adding Books, then copy the entire library into a new library. This process will check each book as it is copied into the new library and when it finds a book that has the same author and nearly the same title as a book that was previously copied, Calibre will copy the new format into the previous record. This method is not suitable for cases where the author/title differ significantly or where the metadata of the first record is worse than the metadata for later books.