...the covers he drew for Strange Tales featuring Doctor Strange (which was every other cover as the Doc alternated covers with his co-star, Nick Fury)!
Strange Tales #160 and #162 (September and November, 1967)
Strange Tales #164 and #166 (January and March, 1968)
Strange Tales #168 and Doctor Strange #169 (May and June, 1968)
Strange Tales would split, with Doctor Strange continuing the numbering of Strange Tales, with Nick Fury, Agent Of SHIELD getting a number one!