For HW, there are 9 books.
For SB, there are 6 books.
The books are a one time use. Once you have it, you will be set to gather from all the nodes for the entire expansion.

If you want to collect the books at a relaxed pace, a full collectability rotation turnin for Zhloe and M'Naago will result in about a book a week for SB and nearly 2 books for HW.