Steve Ditko usually contributed at least one 5- page story per issue, which as far as stories go, were fairly lightweight, but wow, that artwork of his. Kirby and Ditko were artists with distinctive, yet different styles. I still admire the artwork of both of those now-deceased gentlemen, and I can't admire one over the other.
The stories are shown in order by issue numbers. They appeared in Tales of Suspense #6, (1959), #13, #15, #18, (1961).