"Superman's Lost Brother"
reprinted from Superman (1939) #80
"The Sweetheart Superman Forgot"
reprinted from Superman (1939) #165
"The Fantastic Story of Superman's Sons"
"The New Nightwing and Flamebird"
"Kal-El II's Mission to Krypton"
A three part imaginary story reprinted from Superman (1939) #166.
"The Secret of Superboy's Sister"
reprinted from Superboy (1949) #62
DC Giants Series G-66, G-65 is Justice League of America #76 and G-67 is Batman #218