Gronevelt

I enjoyed the fact that Alfred Gronevelt and the Xandau Hotel appeared in both The Last Don and Fools Die. It was pretty cool. I was wondering if this happened in any of the other novels excluding the obvious Clemenza, Mike, and Don Corleone appearances in Sicilian.

If you find any recurrances of characters meeting eachother, make sure to tell us, i'm trying to make a chart of what characters appear where