OK, as far as can tell there are 20 known subjects:
Alexander
Billiard 
Blanding 
Burch 
Curry 
Firestine 
Gordon 
Hooks 
Johnston 
Jones 
Kip
Leidy 
Munsell
Nagel 
Northen 
Slaven 
Stinson
Stringer 
Thebo 
Yantz 
He may have an updated list, but in 2009 Brian M listed the same 20 players through his research.
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					Originally Posted by NashvilleBaseball  I own the Firestine, Gordon, and Nagel Orange Border cards.  I also checked my research notes and I don't believe there are any documented examples of a Dallas, Shreveport, or Fort Worth player which would indicate that during the printing process they corrected the problem after finishing with these teams : Houston, San Antonio, Waco, Galveston, Oklahoma City.  Brian may have some more to add to this as he has been collecting these rascals as long as I have, and has several examples.
 Thanks, JJ
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 Jeremy, in your post you said that they might have corrected the problem after finishing some of the teams. That's assuming that they were printed team-by-team. Does anyone know if this is true? 
It seems to me that if there are 20 known subjects that they could have all been printed together?
Leon, the reason I asked about your friend's yellow card is because of these:
thebocomp.jpg
There's an obvious color progression, and that's what made me wonder....