This is from memory so bear with me. Like with some of the photographic E and W cards, a pool of pictures would be offered to whoever wanted to issue a card set. I would guess that the pictures were licensed for a period of one year at a time in most cases. Printers (lithographers really) probably varied as there is a wide range of quality among issues. There were quite a few lithographic firms extant into the mid 50's, especially on the East Coast so those are your likely printers in many cases.
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