Originally Posted by Martin Bull

Yes - I have copies of both. 'A Hell Of A Bomb' was first on the market ( in paperback only, I think ). It had quite a limited print-run.

'Barnes' Wallis Bombs' was published a couple of years later in hardback. It's almost exactly the same content but one or two minor corrections were made, and the reproduction quality of photos is much nicer in the hardback.

Again, well-worth getting in either version and essential reading for anyone with an interest in the subject !