Given the title is 'History, Design, Techniques, Developments' - there is little of any of the last three. A few short pages on design (unless you include the 'History' section about the evolution of the various rigs), almost nothing on Techniques and precious little on 'Developments' means that this is basically a reference on the various types of Gaff rigs and how the individual locations shaped them. If you want a book on Gaff rig sailing technique I would recommend Cunliffe's enigmatically titled 'Hand, Reef and Steer'. If you want a coffee table book to solve arguments about what is better in a blow, a Bristol Channel Pilot Cutter or a Galway Hooker, then this is your guide.