Bob, I do have a spreadsheet where I keep track of all "E121-like" cards I have visually had evidence of, but it is still very much a work-in-progress. I have only included cards on it that I have 100% knowledge that the front corresponds to the back of the card.
I also have a roughly 10 page article that I have written about the E121-like sets and all the known backs that are included under that umbrella. I had originally planned on having it published in Old Cardboard (Lyman & I spoke about it briefly) but I haven't shown it to Lyman as of yet. I just want it to be as comprehensive as possible before it gets published.
I am constantly adding new info to both of them as more players are found and I'm beginning to see a pattern emerging as to an overall timeline of when each set was produced (at least the sequence when the sets were produced in relation to one another).
-Rhett
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