Please use Bookshop.org instead of Amazon if you decide to purchase any of these books. Amazon is an unethical company, and we should all make an effort to give them less money.
Having said that, there are two books that should make this list, but they are only available on Amazon:
The Psychedelic Experience- Timothy Leary, Ralph Metzger, Richard Alpert ( Ram Dass )
Other books may help but after 1000’s of trips its the only one that makes sense IMO