I'm still not sure of exactly how many cards would constitute the master set since I'm including all variations of team logos and trademarks/registered logos. I'm up to 142, though not all of them are in great condition. Maybe all of the team logo and statistical variations match up with the trademark/registered symbol variations, but I haven't been able to find out a lot about that.
The cards from the cereal box print run(s) are hardest to find in great shape. The factory set variations are not a problem.
I finally got some of the first print variations today including the Geoff Zahn with the Minnessota spelling error.
If anyone has information on why some cards are thicker and more yellowed, let me know.