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If they were purchased from the Apple iBooks store and have DRM, you are out of luck. Apples DRM was changed so often it became very hard to break and most gave up trying.
If instead these are drm free epubs, then you should be able to convert them to work on Kindle. They may be stored as a special kind of folder in Books.app but there are free tools to zip them up to make proper epubs again.
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