Hi John,
I have a copy of the 1993-1996 Casebook.  My copy was in a binder, not coil bound.  A scanned copy is on my website https://www.yachtracingrules.ca/appeal-and-casebooks    If you browse around that site you can see that I am also interested in old rulebooks and casebooks, thus I am not willing to part with the original.  If you have any earlier versions scanned, I can add them to the site.  

Andrew,  Thank you very much.  PDF is better than paper as far as I'm concerned.

I've now got some new 'pillow case' reading to do.

The only historical scan that I've got is the 1944 Vanderbilt Rules, which is attached.

I could also do a scan of the 1947 IYRU/RYA rules pamphlet I have if you would like that?

Thanks to Andrew's copy of the 1995 Case Book, I've updated my Cross References between Pre and Post 1995 Cases for the historically minded.