I have just bought and received a copy of Stevens Irwin 'Dictionary of Hammond Organ Stops version3'. My understanding of the drawbars on my Organ 3 has been vastly increased. It has 150 pages all dedicated to manuals and footpedal drawbars.
Just be careful where you buy it from as some used books are listed at over £90, whilst I bought mine for £7.50.
Anyone else here bought this and how do you like it?