The link I gave to Amazon. If you mean a free online version, I don't know of any. The Structure of Magic, Volume I is probably easier to find as a torrent or something, but it deals mostly with the mapping between linguistic structure and inner models. It predates NLP vI, and was the basis for the method by which they discovered the rep system and strategies model that was begun in NLP vI. It has been literally decades since I read it, and I don't own a copy, so offhand I don't know how illustrative it would be by comparison.