If your counting backs, you can put a whole bunch of the 1916 M101-4/5 tough backs as not completable- I dont even know if 20 total cards exist for the Green Joyce and Mall Theatre cards. I would also think the Altoona Tribune, Block & Kuhl, Burgess Nash, Everybodys, Gimbels, Holmes to Homes, Morehead Baking, Successful Farming, and Wares are nearly impossible unless a complete sheet/collection is found.
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