Out of This World #2 & Spaceman #6 (Re-Post)
Now this SF pulp from Avon had a great 32 page comic insert featuring Kenton of the Star Patrol by Joe Kubert and Crom the Barbarian by John Guinta!
Out of This World #2 (comic insert only) by Joe Kubert and John Guinta!
Spaceman #6 by Jack Sparling!
PS. Caves of Steel file links seem to work OK (in case you asked).