Posted By:
Frank WakefieldVery flexible definition.
T206 = set.
All of the Cubs = a subset.
All of the 150 series Cubs = a subset.
All of the 150 series Cubs Hall of Famers = yet another subset.
All of the Southern Leagers = a subset.
All of the Texas League cards = a subset.
It is whatever you define it to be, isn't it?