In this period the Legion was mostly in the supporting cast of Superboy and, occasionally, Supergirl.
Most of the Legion lore hasn’t solidified yet.
Total number of Legionnaires introduced in this era: 16
Adventure Comics 247
Adventure Comics 267
Action Comics 267
Superboy 86
Adventure Comics 282
Action Comics 276
Superboy 89
Superman 147
Adventure Comics 290
Superboy 93
Action Comics 287
Adventure Comics 293
Action Comics 289
Superboy 98
Some of the Legion Silver Age cameos are in this era.
And here are the LEGION AWARDS for this era!