Bark should probably be barque, since it refers to a ship and bark is a lesser-known US spelling of that word... If there is an existing published copy with bark, though, it's still a possibility. Next, I'm certain that elf should be self, and this can be heard in any recording of Crowley reciting this poem.
This is a beautiful poem. Despite what Plague Rose may say, more than a cursory glance at Crowley and his works is necessary to truly comprehend such a man - especially a man so entrenched in controversy and biased misinformation, both for and against him. If nothing else, surely poems such as this should be evidence against having an evil character.