that's brilliant! i love that they kept the adverts.
I've just started collecting CU Amiga magazines with the covedisks as to be honest AMR wasn't quite cutting it for me.
I think I may be able to help though. Most of my magazines have barely yellowed at all. I was lucky enough to pick some up from someone that knows how they should be store properly and i've now done the same and put them in Mylar