The basic rules were the same then as they are now. There is typically a rule or two changed each year...sometimes more, sometimes less. I'm thinking the Designated Hitter was added to the AL rules during this time period, which was a significant new rule, but most new rules or rule changes are minor.
Rules for Radicals was created in 1971.
Rafferty's Rules ended in 1990.
Baseball - 1971 VG was released on: USA: 1971
Potsworth and Co- - 1990 When Bubba Rules 1-7 was released on: USA: 13 October 1990
Go on line to MLB.com and search for rules, or google baseball rules.
Great Performances - 1971 The Rules of the Game 3-15 was released on: USA: 30 April 1975
Jose Romero - Australian rules footballer - was born in 1971.
The cast of This Week in Baseball 1990 - 1990 includes: Mel Allen as Narrator Cecil Fielder as Baseball Player Cecil Fielder Nolan Ryan as Baseball Pitcher Nolan Ryan
Vantive was created in 1990.
Tiny Toon Adventures - 1990 Mr- Popular's Rules of Cool 1-48 was released on: USA: 10 December 1990
don't cheat and that's all the rules
Soul Train - 1971 - 20.4 was released on: USA: 13 October 1990