Hey MikeF, I think a big part of the cheat sheet idea comes down to how much your nephews want to pore through details. I have personally made cheat sheets for myself so I don't go nuts looking for every possibilty on every single coin I come across. What kinds of things are they interested in? Some stuff is rare but not necessarily highly sought after. Would they only be interested in especially visible stuff? Only things that would be valuable? Anyhow, for what it's worth, you're welcome to PM me and I can send you what I use, though I do occasionally change it if I get tired of looking for something or hear about something I'd missed before.