Baseball rules - Wikipedia
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MLB 2019 Official Baseball Rules Book
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2018 Official Rules of Major League Baseball | Triumph Books
2020 Official Rules of Major League Baseball: Triumph Books: 9781629377865: Amazon.com: Books
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2019 Official Rules of Major League Baseball by Triumph Books
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1949 Official Baseball Rules- National Baseball Congress of America | eBay
Baseball Rule Sets (a guide) - UmpireBible
