I still have a bunch of these and do sell duplicates when I get them on ebay and in one of my listings there I have an image of some pages from "Sports Scoop" an early hobby publication (one of the better ones they ever made) that has the first 5 series of (8) cards listed. I have another ad somewhere that talks about the bonus cards being available by purchasing multiple series.
Here is the listing with the first 5 series checklists...
https://www.ebay.com/itm/1974-Bra-Ma...QAAOSwpZNccZFx