I guessed as I am not at home. I would say at this time I have about 25 books. I used to have a lot more but I have donated or gave away some of the older ones & the ones that I have read again & again.
Which reminds me, I should go through them again and get rid of some. I know there is like 5-10 that I don't need/want/use anymore &/or know them by heart.