George Allen & Unwin, London, 1976.  ISBN 0-04-786005-7.  Hard cover, 207 pages including Supplement and A Closing Word.  Translated by Leigh Gerdine.  Very good plus; red cloth with silver lettering on spine; binding sound, red top stain with a spot of soil.  Dust jacket has a few short edge tears, some rubs and a bit of soil, light edge creases, publisher’s sticker on lower front flap.  Book interior clean and unmarked; black & white frontis.  ‘His suggestions for the performer are based upon the best contemporary scholarship, brought to bear in practical terms. … By treading a middle ground between the superficial introduction to the work and the excessively scholarly, this book hopes to advance the standard of understanding of a major keyboard work of Bach and to be a helpful guide to the performer who wants to play the preludes and fugues from an Urtext edition. (from front flap)