Oops, I meant "rookie" cards, mostly of HOF players!
Anyway, the thrill of this "set" is that it is always evolving as new items become known. My checklist is always in a state if flux. As an example, when this 1892 Kreb's BBC Studio Cabinet was unearthed, my checklist had to be modified. This might be frustrating to some, but it's what keeps this hobby interesting to me. Half the fun for me is the research that goes into discovering earlier and earlier images of star players.