delete duplication specific format
many books - let say for example - Peace and War - EPUB format only
many books - Anna Karenina - EPUB FB2 LIT MOBI LRF (one title, merged by Calibre)
many books - Crimea war - MOBI and LIT (or LIT only or FB2 only)
so, only 1 author and 3 books by Calibre but many files i do not need. I like to have only EPUB and FB2(like it), i trust Calibre converter (should i?) and hope will able to convert epub to mobi, for exampe, if will need.
can i delete other formats except EPUB FB2 if exist ? Is it possible by bulk for ALL library books automatically ?
if yes, the result of above example will be
Peace and War - EPUB
Anna Karenina - EPUB FB2
Crimea War - EPUB