topps history vintage cards

Although baseball cards are a big part of our "lives", very little seems to be know about how vintage BB cards were distributed, etc.
For example, I once read where topps actually had a formula in deciding what players cards were included in a particular series.
Does anybody out there know any details on this.
Also, please notice how the last or next to last series of cards always included fringe players (especially in the 1959 and 1969 and 1972 sets) who were not originally expected to make the team.
Obviously, this means that these cards were printed after the season started.
Also, the 1969 Dick Ellsworth shows him as an indian even though he was traded to them at the end of april, 1969.
This leads me to my second point, does anybody have any "history " of how long each series was out until the next series was issued and tryically, when the series were issued.
I do know for example that for example the final series of 1972 was in stores at mid July. I also know thru my cluttered mind that the 3rd series 1969 cards were issued around the 25th or so of April, as it happened to be the day of report cards.
Anybody like to contribute to this post?
thanks
In the USA all men are created equal but some are more equal than others....
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Bob
email bcmiller7@comcast.net
Topps Wiki Entry would be a good place to update any info you can find out
They did this right up through the 80s. Maybe they still do it, i stopped collecting topps in 1989.
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