This is to announce that a full hyperref pdf of the current version of this book is available from www.bangor.ac.uk/r.brown/nonab-a-t-.html (4.2MB, xx+496 pp) Comments welcome; we are aware of minor faults but hope this version will be useful as a big step towards the final version, and even stimulate further work! Ronnie Brown [For admin and other information see: http://www.mta.ca/~cat-dist/ ]