1972 World Series
The hairs versus the squares': How the 1972 A's won it all while breaking barriers with their upper lips - The Athletic
National Baseball Hall of Fame and Museum - #OTD: 1972: #Athletics hold baseball's first-ever Mustache Day at the Oakland Coliseum. Owner Charlie Finley paid his players $300 each to grow a mustache
The A's Winning the 1972, 1973, and 1974 World Series
What are the best mustaches in Oakland A's history? - Athletics Nation
What are the best mustaches in Oakland A's history? - Athletics Nation
1972 World Series 50th Anniversary Reunion
Today in Baseball History: Oakland's Mustache Gang is born - NBC Sports
Mustaches and Mayhem: Charlie O's Three-Time Champions: The Oakland Athletics: 1972-74 (SABR Digital Library): Greene, Chip, Greene, Chip, Erion, Greg, Levin, Len, Nowlin, Bill, Wolf, Gregory H., Wancho, Joe, Armour, Mark, Costello
A's shut down Big Red Machine in thrilling Game 7
Today in Baseball History: Oakland's Mustache Gang is born - NBC Sports
1972 World Series 50th Anniversary Reunion
Mustaches and Mayhem: Charlie O's Three-Time Champions: The Oakland Athletics: 1972-74 (SABR Digital Library): Greene, Chip, Greene, Chip, Erion, Greg, Levin, Len, Nowlin, Bill, Wolf, Gregory H., Wancho, Joe, Armour, Mark, Costello
Mustaches and Mayhem: Charlie O's Three-Time Champions: The Oakland Athletics: 1972-74 (SABR Digital Library): Greene, Chip, Greene, Chip, Erion, Greg, Levin, Len, Nowlin, Bill, Wolf, Gregory H., Wancho, Joe, Armour, Mark, Costello
A's shut down Big Red Machine in thrilling Game 7