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The best way is to make sure that you have a copy of his complete library folder including the metadata.db file. Then in Calibre you can use the Switch Library facility to switch across to his library and at that point select the books of interest, and use the Copy to Library facility to copy the books (including all meatadata and covers) into your library.
If you can only get the actual ebook files, then you should put them in a folder that is outside Calibre. You can then add the whole folder in a single go via the Calibre Add Books functionality. Since Calibre makes copies while adding, when you have completed the add you can clear the folder holding the books.
Yet another way to do is to make use of the new Calibre 'Watch Folder' functionality. If using this feature then any ebooks added to the 'watched' folder are automatically added into your Ca;ibre ;library.
The downside of these last two approaches is that they can only make use of metadata that is embedded in the ebook files, while the first one gets it directly from the calibre database in your friends library so is more likely to be complete and accurate.
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