Love your Greeny FF's!
Red you have a very special collection full of beautiful Green River pedigree's. I myself, am mainly an FF collector, and I'm only familiar with the FF registry sets. Other than your Greenies Red, I think Captain Tripps and CGC World are your competitors for the most pedigree's of an individual type. Captain Tripps, well, we all know what his set is all about, but CGC World has a collection full of beautiful White Mountains. I'm a late comer into the world of pedigree's, but I am very proud of my 18 assorted pedigree's in my silver age Yancy Street Collection!