Obstruction (baseball)
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- BOSTON UNIVERSITY INTRAMURALS Department Of
- Runner Interference Rule
- USA Softball - Rule Speed Sheet
- 2015 and 2016 Ncaa Baseball Rules
- 2021 Official Baseball Rules
- 2018 and 2019 NCAA Softball Official Rules Interpretations, Clarifications and Situations Vickie Van Kleeck, Secretary-Rules Editor Last Updated 4/30/2019
- Obstruction and Interference
- Triple Play™ Ramp Door
- Scorekeeping Guide Book
- The Automated Scorebooktm for Baseball/Softball
- The Box Score in Baseball Timeline for the Rules of Baseball Umpire History
- Obstruction and Interference
- NCAA Baseball Interpretation Clarification of Obstruction/Collision Rule/Plays at the Plate Rules 2-55, 8-7 February 2018
- Softball Rules
- 2-Pitch Softball Rules
- Rules That Catchers and Plate Umpires Need to Know…
- Defensive Obstruction Rule
- The Official NCAA Baseball and Softball Scorebook