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I do not know if there were ever red and green rule books issued to umpires. Having never been a MLB umpire, one was never given to me.
I do know there were the AL and NL Red and Green books (and no, I do not remember which was which) that were used in the press box. These were hard cover books, and I saw some with spiral binding so they would lay flat when opened.
The did contain the rules, along with many records, previous years results by team and by player, etc., and were primarily used by the media. They were certainly not of a size convenient for carrying around as a rule book would be.
When first issued, these were only available through the MLB clubs. Later they were offered for sale through some league representative, and even later, were sold in bookstores after the Bill James stat expansion of the 1980s.
If these are the Red and Green books in question, the rules were a very small part of the contents. But they were there, so I guess that made these "red and green rulebooks".
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