The Worst Trade in Cardinals History - OnlyCardsFans
September 15, 1969: Cardinals' Steve Carlton sets record with 19 strikeouts, but Mets, Swoboda prove to be Achilles' heel – Society for American Baseball Research
Philadelphia Phillies won 3 teams' all-time worst trades
A Forgiving Look at the Steve Carlton Trade 49 Years Later - Viva El Birdos
February 25, 1972: Cardinals trade Steve Carlton to the Phillies
MLB Notebook: Ranking the Best (and Worst) Red Sox Trades of All-Time
Ranking the Cardinals' all-time left-handed pitchers
MLB worst trades: The absolute worst trade in the history of every MLB team
Worst Cardinal Trades of the Last 40 Years
You can't tell the story of Curt Flood without Dick Allen - Viva El Birdos
30 trades, 30 mistakes: Ranking each MLB team's worst-ever move - The Athletic
How Bad? Worst team since… : r/Cardinals