Padres history (June 12): Dock Ellis' trip to San Diego - The San Diego Union-Tribune
Reunion of Pirates' 1971 World Series champions brings back memories
The Team That Changed Baseball: Roberto Clemente and the 1971 Pittsburgh Pirates: Markusen, Bruce: 9781594160899: : Books
While Jackie Robinson's breakthrough in 1947 opened the gates of opportunity for African Americans and other minority players, it was not until 1971 when a team first enjoyed a full and complete level of integration, with half of its twenty-five-man roster comprised of players of African American and Latino descent. That team was the Pittsburgh Pirates, managed by an old-time Irishman.
The Team that Changed Baseball: Roberto Clemente and the 1971 Pittsburgh Pirates [Book]
What made MLB's 1971 All-Star Game in Detroit one of the best ever
Reunion of Pirates' 1971 World Series champions brings back memories
1971 Topps 2 Dock Ellis Pitcher Pittsburgh Pirates Ace
The best players to wear every jersey number in Pirates history - The Athletic
OTL: The Long, Strange Trip of Dock Ellis - MLB - ESPN
Pittsburgh Pirates Autographed Baseball Memorabilia
Pittsburgh Pirates - Game Used Only
September 1, 1971: Pirates field first all-Black lineup in baseball history – Society for American Baseball Research