This issue has variants.
Reprints Doctor Strange (Marvel, 1968 Series) #180-183, The Sub-Mariner (Marvel, 1968 Series) #22, The Incredible Hulk (Marvel, 1968 Series) #126, Doctor Strange story from Marvel Feature (Marvel, 1971 Series) #1 and Marvel Premiere (Marvel, 1972 Series) #3-8.
Detail from the cover of Doctor Strange #182
Colan and Palmer's original cover art to Doctor Strange #180, unused at the time as it was lost in the post!
Production proof of page 11 of Doctor Strange #182, showing editorial notes and different dialogue.