Aside from his piano playing, he also edited a collection called "Encores of Famous Pianists", which I am fortunate to own. It is, I believe, out of print now but if you are lucky enough to come across a second hand one, snap it up - it is an exceptionally well edited version of many pieces difficult to obtain elsewhere.
What are the pieces in that collection?
@ j_menzNice one! I wonder, did he add loads of footnotes regarding technical issues, in these Encores? If so, I reckon they are extremely useful, right?
Are you familiar with the Alkan collection he edited for Schirmer, by any chance? I suppose it could be interesting for you...