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J/R is very valuable. Of the publicly available (BRD, PBUC, J/R) books, J/R is the only one which is intended to be comprehensive, covering all of baseball's written rules and interpretations. The PBUC manual is especially spotty in its coverage, and of course the BRD is heavily slanted towards rules which vary among OBR, FED, and NCAA.
J/R offers a coherent view and framework of the rules of the game, and in my opinion that makes it the most useful for learning the fabric of the rules.
Anyone who is serious about the rules of baseball should own all three.
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