Cincinnati Reds - Today in Reds history, 1971: The club acquires Joe Morgan, Jack Billingham, Cesar Geronimo, Ed Armbrister and Denis Menke from the Astros in exchange for Lee May, Tommy Helms
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Ed Armbrister – Society for American Baseball Research
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At the Helms - BallNine
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CardCorner: 1971 Topps Joe Morgan
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The best baseball trades ever: Boston Red Sox have two of them - The Washington Post
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Joe Morgan: Top 5 moments from his career with Cincinnati Reds
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Egger: This Big Red Machine cog belongs in the Hall of Fame… and it's not who you think - The Athletic
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Remembering Joe Morgan and the final piece to the Big Red Machine, Tuesday News
What are the 2 stupidest trades in baseball history? - Quora
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Astros' biggest Winter Meetings moves
10 Biggest Trades in Reds History
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ANY ONE OF FIVE CAN DO - Sports Illustrated Vault
Biggest Winter Meetings move for all 30 MLB teams