Good evening, Rollie: The ISBN number is 0-946184-71-2 Published by Waterfront Publications 463 Ashley Road, Parkstone, Poole, Dorset BH14 0AX U.K. As for the differences, yes, I can see quite a few. However, I don't know when exactly this plan fits into the Britannic's history, so I can't say whether or not it represents the ship as built. My guess is that this might have come from "The Shipbuilder" as the plan says "For Description,See Page 273" on it in a way similar to plans I HAVE seen in reprints of that magazine. Tell you what. If you can't get this from the publisher, or through Amazon, let me know and I'll send you a photocopy of the plans. JIM