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Subject
- Major League Baseball (Organization)--History--20th century.[remove]3
- Baseball.2
- National League of Professional Baseball Clubs.2
- Sports.2
- American League of Professional Baseball Clubs.1
- Baseball--Training.1
- Cincinnati Reds (Baseball team)1
- Mack, Connie, 1862-1956.1
- New York Giants (Baseball team)1
- Oakland Athletics (Baseball team)--History.1
- Philadelphia Athletics (Baseball team)1
- Philadelphia Phillies (Baseball team)1
- Polo Grounds (New York, N.Y.)1