13 of them.
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Regular solids
13 of them.
There are 13 books. Book 13 is about regular solids.
The chapters in Euclid's Elements are called books, there are thirteen in all.
I believe their are about 75 books in the Eastern Orthodox bible. Below is a link to Wikipedia. org that shows the different books, their names, and whether or not they are from the Jewish, Protestant, Catholic, and/or Eastern Orthodox traditions (they also list the original language it was written in).