A new National Agreement signed by the National Association of minor league clubs officially organizes professional baseball under one comprehensive set of rules.

September 11, 1903October 21, 2023 This Day In Baseball

On September 11, 1903 — A new National Agreement signed by the National Association of minor league clubs officially organizes professional baseball under one comprehensive set of rules.

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Sources:
Baseball Reference September 11
National Pastime September 11
Retro Sheet
Hall of Fame
SABR Games Project
Replay The Game

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