What was is the largest stadium in Argentina that some of the group matches of the 1978 FIFA World Cup were played in?
1978 FIFA World Cup Group 1:  All six group matches were played either at Estadio José María Minella in Mar del Plata, or Estadio Monumental in Buenos Aires. Estadio Monumental Antonio Vespucio Liberti: Estadio Antonio Vespucio Liberti (] ), also referred to as River Plate Stadium, Monumental de Núñez or simply El Monumental, is a stadium in the Núñez district of Buenos Aires, Argentina, home of the football club River Plate. Estadio Monumental Antonio Vespucio Liberti:  It is the largest stadium in Argentina with a capacity of 62.000 and also home of the Argentina national football team.
Estadio Antonio Vespucio Liberti