I'm in the UK so I got it from amazon.co.uk. On the actual amazon site it was listed as about £23.00, but I got it for just £8.00 from an 'amazon seller'. People go on there and list their items as well, so there are quite a few book companies who list their books on amazon marketplace, it's a really good way of getting sales.
Anyway this company was called 'Elephant Books USA' or something like that. It was shipped from the USA I think, so if I give you the website for Elephant Books, if you are in America you can get it from them.
www.elephantbooks.com
Just search for 'Boxing Register'. It should come up with two editions of the book. I think that there are 3 editions of the boxing register overall, but I have the most updated one and that is 2002. It's a brilliant book, it has everything really. All of the hall of fame boxers are in there. It starts with bare knuckle fighters, then moves on to like the 1800's and eventually moves on to 'modern era' with all the greats like Ali, Leonard, Liston, etc. Most boxers have their full records but some have a number of 'selected' bouts listed instead. There's also a lot of pages near the back about legendary promoters, referees, managers, journalists, etc.