Hardback and paperback books are considered a mixed material and should be placed into the trash.
Reduce and Reuse
Check out books from the library instead of purchasing. Or, visit your local used book store to buy used instead of new books.
Consider donating to the Friends of the Boise Public Library (https://www.boisepubliclibrary.org/about/support-your-library/friends-of-the-library/) or a local thrift store, selling on an online marketplace, or gifting the item through your local Buy Nothing group.