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Subject
- Major League Baseball (Organization)--History--20th century.1
- Mellon, Andrew W. (Andrew William), 1855-1937.1
- Mine explosions--Pennsylvania.1
- Monongahela River (W. Va. and Pa.)1
- National League of Professional Baseball Clubs.1
- New York Yankees (Baseball team)3
- Pittsburgh Pirates (Baseball team)3
- Railroad trains.1
- Railroads, Cable.1
- Ruined buildings--Pennsylvania--Pittsburgh.1
- Speeches, addresses, etc.1
- Sports.1
- University of Nebraska--Football.1
- University of Pittsburgh--Football.2
- World Series (Baseball)2