Super Bowl XII - Wikipedia
1977 Super Bowl XII Dallas Cowboys Championship Ring – Best Championship Rings
Super Bowl XII - Wikipedia
1990 NFL Pro Set Harvey Martin Dallas Cowboys MVP Super Bowl XII NFL Card
The 25 greatest Dallas Cowboys of all time
Ring from Dallas Cowboys Super Bowl XII 1978 championship win
After playoff dud, Brady faces choice of whether to continue
Super Bowl 12 - Broncos vs Cowboys Score, Winner, & Stats
SUPER BOWL XII CHAMPION 1977 DALLAS COWBOYS
Dallas ISD Athletic HOF Spotlight: Harvey Martin
Super Bowl XII first NFL championship game in domed stadium Superdome
Super Bowl: A year-by-year review – Sun Sentinel
Harvey Martin (79) Dallas Cowboys defensive end nails Philadelphia Eaglea quarterback Ron Jaworski as he tried to get off a first period pass in Sunday's NFL game in Philadelphia, Pa. Oct. 23
The 25 greatest Dallas Cowboys of all time