I believe the other three belong to a set called '1972 Classic Cards.'
I don't know *too* much about them, except that, well, they were issued in 1972. I believe it'll say on the back, but I believe they were issued in Flint, Michigan. The set consists of 120 cards distributed in 4 30-card series.
They are tough. It took me years to track down a George Gibson card for my collection, and I had to buy the entire 30-card series to get it. On the plus side, that also landed me a Bill O'Hara.
Cheers,
Richard.
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