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An iBooks reader for Mountain Lion still does not exist in 2015.
[Yes , I am still using ML. I found Yosemite really clunky compared to ML , and disliked the interface]

Calibre is a good all purpose reader, but I find it also slow and kind of clunky particularly on larger , more dense files.

A nice clean reader for books with an .ibooks extension files would be handy if anybody can recommend such a thing.
Thanks !
 
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