Rather than take the time to meticulously hunt down and add public domain copies of Crowley’s work, we figured it would be easier to send you to this site The Libri of Aleister Crowley
All of his books are listed including his spectacular resource 777 . I must also mention his book The Moonchild , though it is fiction based it makes for a very enthralling and intriguing read. Which I would recommend for anyone interested in Thelema.
A final note, despite the fact all of his books are listed it seems there are not copies of all of them there.