Hawkmoon: The History of the Runestaff (1967-'69)
The Jewel In The Skull (1967)
Sorcerer's Amulet/The Mad God's Amulet (1968)
Sword Of The Dawn (1968)
The Secret Of The Runestaff/The Runestaff (1969)
Omnibuses
Box sets
Comics, graphic novels/adaptations, etc.
Foreign (non-English) language editions