Hello Mr. Hungo,
I do have a suspicion of many uncatalogued issues from said years. How many, who knows. As we know, cards are (were) a great marketing tool, so I see no reason why local businesses wouldn't use their towns minor league clubs as an advertisement opportunity. Many of the towns are quite small so, some of the card issues may have disappeared into history.
As for the Dallas/FW cards. Don't know why the cards would be uncatalogued. Maybe low distribution left this issue in history too. Fellow Net54 member says they may have been released by a construction company. I'm still researching the set.
I also found the image on worthpoint. I search Canadian born players. I have found another issue which was not listed in Bob' guide. Some sort of Padres set from the '50's . Large than a standard card. but smaller than a PC. So yup, I've been surprised before.
Cheers!
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