Have to agree with Johnny G.
I spent a lot of time in Art's house too, and the books were mysteries, thrillers, and books about sailing - nothing esoteric.
I just read Mya Szalavitz' book too, and while I think she has some great first person accounts from Straight and other treatment centers, I don't think her Seed stuff is entirely accurate.
Obviously, Art copied a lot of the Seed's format from AA, which in turn copied from the Oxford Group and Frank Buchman's Moral Rearmament group (how come no one is interested in this? - this is the real origin of all of this stuff). Art did say he had worked at Bellvue, in NY, a notorious asylum. I never heard of any Synanon connection unless Bellvue was experimenting with these techniques.
Hitler Youth is kind of silly. Art was a veteran and fought the Nazis..."Art's Army" was meant to be a wholesome, anti-counterculture group and in that way reflected the ideals of the pre-Nazi german youth movement (Boy Scouts, similar).
So, look elsewhere. Look to the creepy Frank Buchanan, for Christ's sake!